Funny / Undertale

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     General 
  • This one's exclusive to the demo: in your scripted first fight with a Froggit, choosing to compliment it reveals that it's scared — of Toriel, who slides on-screen and glares at the Froggit until it leaves, automatically winning the fight for you. Conversely, if you threaten the Froggit, it'll be flattered. In all other Froggit encounters, including this encounter in the full game, the two actions have opposite outcomes.
  • Examining the cactus in Toriel's room:
    Ah, the cactus. Truly the most tsundere of plants.
    • During your fight with Papyrus, if you insult him after some flirting, he'll call you an emotional cactus who hides their true feelings.
    • Checking the cactus again during the epilogue:
      It's not like this cactus was waiting for you to come back or anything...
    • On a similar note, Hotland has an enemy named Tsunderplane who also acts passive-aggressive.
  • Getting the Instant Noodles from Alphys's fridge and eating them in a fight, which involves all the typical steps of actually making instant noodles, including the waiting. Not only does it stretch the definition of "a turn" to its absolute limit, but it typically heals 2~4 HP, with a rare chance of healing all HP. During final battles you eat them raw and dry instead, which somehow recovers 90 HP. Especially funny if you eat them during Mettaton EX's fight, as you get to imagine the audience is watching you slowly make those noodles.
  • Some of the items in your inventory get some rather silly names when shortened in the battle menu or the Temmie Shop, like "SpiderDont" (Spider Donut) and "ButtsPie" (Butterscotch Pie).
  • When you use a SpiderDont in battle, it says "Donít worry, the spider didnít."
  • When inputting a name at the beginning of the game, you have room for 6 characters. Trying to input the names of various NPCs will elicit interesting reactions, though major ones will not let you use their names... for the most part. But if you input "Papyru(s)"...
    "I'LL ALLOW IT!!!!"
    • Similarly, inputting "Metta(ton)" or "Mett(aton)" will get this reaction.
    "OOOOH!!! ARE YOU PROMOTING MY BRAND?"
    • Putting in "Jerry" simply results in the following response:
      "Jerry."

  • Pretty much the entirety of the secret game mode triggered by typing in a certain name at the beginning. In the hard mode unlocked with the name "Frisk", the normal story continuity is thrown out of the window. When you get to the Toriel fight, the fourth wall is completely obliterated, with Toriel shrugging off (potential) death to go and make pies. Flowey's reaction to the whole thing just makes it even better. And then there's Annoying Dog having eaten one of Toriel's pies while you were fighting. And trying to deny it. The annoyed look on Toriel's face is priceless.
    Annoying Dog: I thought it was good. Theoretically. It's not like I ate it all while you were fighting.
    • In normal mode, you can take up to 4 pieces of candy from the pedestal. In this mode? "In this hellish world, you can only take 3 pieces of candy."
    • After you clear the secret mode, wait for a bit before exiting the game. Flowey will pop up on schedule, wondering why you haven't reached his room yet. He comments on the hard mode logo, and then mocks you for being a tryhard. Wait a bit more, and he taunts you about the ending and eventually gets to say his "Don't you have anything better to do?" catchphrase... only for the Annoying Dog to inform him from offscreen that he used the phrase just moments earlier. Flowey's reaction to having his ammo taken away is to hold his basic "smile" expression for a few seconds, before retreating underground again. Note that it's basically the game's creator telling Flowey to shut up.
  • Any of the interactions between Papyrus and Undyne, especially when over the phone. Undyne spends most of them trolling Papyrus, including confusing him, grossing him out, and occasionally hitting him with furniture.
  • According to the soundtrack, the cave-like ambiance "song" that plays at certain points in the game is called "Ooo".
  • The save file screen that appears after booting up the game shows whatever characters you have befriended. If you turn on the game in between the Alphys date and the fight with Asriel, it shows Undyne standing on Papyrus standing on Alphys, with Toriel simply sitting in a chair reading. What really sells it is a sign that says "out to lunch", which was likely written by Sans.
  • The Temmie, especially when they attack... by petting.
  • If you flee from a battle, your SOUL literally sprouts legs and walks away. Even funnier when people found out that the graphic's internally referred to as "heartgtfo" within the game.
  • Pretty much everything about The Abandoned Quiche. It's a healing item that was Very Loosely Based on a True Story of Toby Fox finding an uneaten quiche under a park bench. Its item description is "a psychologically-damaged spinach-egg pie", and you find it next to an echo flower that bemoans "I just wasn't ready for the responsibility." Finally, in a bit of dark humour, dropping the quiche results in a unique message:
    You leave the quiche on the ground and tell it you'll be right back.
  • The very fact that the Big Bad is named Flowey. And when you find out his true identity, it becomes even funnier. It seems that Asgore's Giver of Lame Names trait runs in the family.
  • Fans have begun text corrupting the game, and needless to say, the results of the characters saying other characters' lines, their own (misplaced) lines, lines from the narration and/or battle screen, and lines that aren't even meant to be dialogue in incorrect form is unbelievably hilarious.
  • In the original kickstarter, Toby had a comment about "a nice area with a shower, air conditioning, and a bunch of fun movies to watch". What place was he describing? The True Labs.
  • The button config has an "Analog Sensitivity" slider, which is used to determine how much tilt of the analog stick is needed for the game to respond to analog stick input. Then there's the "Analog Sensitivity Sensitivity" slider, which is used to adjust the sensitivity of the above slider and nothing else.

     Meta 
  • During the Kickstarter campaign, Toby's rules for the NPC reward tier recommended that backers create a snail NPC because they are actually monsters in real life.
  • Papyrus and Sans hosts the video explaining the Kickstarter tiers.
    • At one point, the following exchange happens:
      Papyrus: "FOR $30 DOLLARS, GET THE SOUNDTRACK, FEATURING A VOCAL TRACK BY ME, PAPYRUS."
      (Song changes)
      Papyrus: "IT'S CALLED 'PAPYRUS'S COOL SONG.'"
      Sans: "$31 and i'll give you the soundtrack without that song."
      (Kickstarter text below "Download Soundtrack", reads, in Sans' font, "no dumb song")
      Papyrus: "WELL $32 AND I'LL GIVE YOU A VERSION WITH ONLY MY SONG!!"'''
      (Kickstarter text below "Download Soundtrack", reads, in Papyrus' font, "ONLY DUMB SOng" [sic])
      Sans: "Done."
      Papyrus: "DONE."
      Sans: "Done."
      • Even better? They were actually tiers in the Kickstarter, and people actually bought them.
    • When they announce the "Your fantroll becomes canon" kickstarter tier near the end of the video,
      (Kickstarter text becomes wavy while a whistle-like sound plays)
      Sans: "at $1000, your fantroll will become canon within undertale."
      Papyrus: "FANTROLL??? THAT'S AMAZING! (WHAT IS THAT)"
      (Sans takes out a drink)
      Papyrus: "WAIT A SEC... SANS... WHAT DID I TELL YOU ABOUT BRINGING DRINKS INTO THE MYSTERIOUS BLACK VOID!?"
      Sans: "whatever, mom."
      Toriel (off-screen): "Is someone talking about me?"
    • Immediately after that,
      Papyrus: "NEXT SECTION!!!"
      (Screen flashes, "NEXT SECTION")
      Papyrus: "GIVE ME ALL YOUR MONEY"
      (Video cuts off)
    • A nice notice is when Sans drinks his drink, you can actually see the drink spilling out of his jacket.
  • On the Kickstarter page, Froggit can be found listed as one of the staff members. He...doesn't know why he's there.
  • Within the Kickstarter FAQ,
    PAPYRUS IS COOL.
    That's not a question.
    PAPYRUS IS COOL?
    AGREED. ALSO, YOU ARE QUITE HANDSOME.
  • A couple of Flowey's messages on the Twitter page are hilarious in a Crossing the Line Twice way, the joke being that LOVE in this game refers to your Character Level, and increasing it requires you to kill the monsters you meet. And when you or a strong monster reaches 0 HP, your heart-shaped soul literally shatters. LOVE is actually an acronym for "Level Of ViolencE". It's increased by gaining EXP, or "EXecution Points."
    Strive every day to increase your "LOVE." Remember, "LOVE" comes easiest from friends and family. =)
    Happy Valentine's Day! It's the perfect day to increase your LOVE. =)
    Show them how you REALLY feel. I'm sure you'll create some unforgettable memories in the process!
    Make sure not to break any hearts today ;)
  • The Greenlight Trailer is pretty funny.
    • The video starts with the Annoying Dog-as-Toby Fox walking onto the screen and introducing himself... only to draw a blank on what to say. He then walks backwards off the screen.
    • The room in Waterfall where you can get the artifact is shown... but Toby hasn't put in collision detection, so the player walks off into the black emptiness around it. When they go out far enough, who else is there to greet them but Sans?
      Sans: hey, have you noticed there's no collision in this room?
      Toby: You're ruining the trailer
      (Papyrus rushes over through the void.)
      Papyrus: CAN I BE IN THE TRAILER???
      Toby: NO
    • When Toriel is shown guiding the player through the spikes, the game talks about there being a mom-like character in the game. Cue Papyrus rushing in assuming it's him, interrupting the scene. Toriel's look of surprise as she turns towards Papyrus really sells it.
      Papyrus: IS THAT ME? AM I THE MOM?
      Toby: (In gigantic letters) NO
      (Cut to black screen.)
      Toby: well maybe
  • The release trailer. Epic music plays as many scenes of the game are shown in action, when all of a sudden it presents you with a scene of a 3D engine completely different from the game, and the words 'PROBABLY NOT ACTUAL GAME FOOTAGE' written in the bottom. We see a very badly made 3D model of Toriel just being rammed facefirst into a pile of blocks, while in the background a Toriel with a realistic looking goat face grimaces and says "my child you are breaking my heart". It only lasts for about a second and a half, but it's still hilarious.
    • The fact that Flowey, of all characters, pops up over the "The friendly RPG where no one has to die" text at the end is equally hilarious, in a Crosses the Line Twice kind of way.
  • The game's soundtrack is listed as a payed downloadable content on Steam, complete with having "system requirements". While the "minimum" requirements states the obvious, the "recommended", in contrast, falls straight into Deadpan Snarker territory by stating that, among other things, the recommended operating system is "Windows 90000000", recommended processor is "Special processor that can play 9000 songs per second", recommended graphics card, "Special Graphics Card That Makes Music Look 3D For No Reason" and recommended soundcard being "Sound Card That Makes Music Sound Like Live Orchestra When Its Not".
  • Watching any Let's Player's reaction when they face certain bosses, most notably Mettaton EX, Photoshop Flowey, and No Mercy Sans, for the first time is always good for a quick schadenfreude.
  • The release trailer opens with a few scenes from the start of the game. In one of them, the protagonist reads a sign saying "Please don't step on the leaves." Cue the protagonist completely ignoring the sign and walking in circles on them.
    • The fact that the release trailer includes "Make strange friends" and then adds a rather uncertain "...?" after it over footage of Sans and Papyrus is rather amusing in a fitting way.
  • Toby Fox couldn't show up to the Independant Games Festival to accept the award Undertale won, so he made a video instead. And "credits" for the video.

     Ruins 
  • Flowey's increasing rage (and increasingly disorted theme music) when you don't fall for his trap is hilarious, especially if you're doing it in revenge for him chiding you on a previous game. After the second time, he accidentally says "bullets", then looks over at his speech bubble and changes it to "friendliness pellets". Eventually, he completely loses it, reveals his Nightmare Face, and launches his unavoidable attack as normal.
  • If you complete a non-pacifist run and spare Flowey at the end, his speech to you at the beginning of the second playthrough is hilarious, both because of how hypocritical and out of character it sounds coming from him, yet he's still completely right:
    Flowey: Hey. Remember. DON'T kill anyone. ...I can't believe this is a REAL thing I have to remind you. Good luck!
  • A blink-and-you'll-miss-it moment happens when Toriel knocks Flowey off — he makes a pretty funny sound and an even more hilarious face.
  • When Toriel has you practice monster encounters with the Dummy, if you repeatedly miss your attacks or try to spare it instead of talking, eventually it gets tired of your "aimless shenanigans" and just floats away. Toriel's expression after the fight ends is the cherry on top. You can tell she REALLY wasn't expecting that. Becomes a Brick Joke a few areas later: The Dummy was actually haunted, so yes, it really did get annoyed and leave.
  • Even for a tutorial area, the earliest enemies are hilariously unthreatening. Whimsun will flee the battle if you try to talk to it. Froggit "doesn't seem to know why it's here", and checking its stats gives the description "Life is difficult for this enemy."
  • The very first "random" encounter, a Froggit, occurs while you're still following Toriel through the halls. If you do any Act or Spare it, Toriel will slide in from the side of the screen and give it a Death Glare, causing it to sheepishly slide the other way.
  • If you tell one of the Froggits that you think the tip about yellow enemy names isn't useful, you can elect to turn them off. If you talk to it again and want to toggle the names on again, it tells you that they already threw away the yellow names and now they need to wear pink ones instead. You can then find the discarded yellow names in one of the junk piles in the Trash Zone.
    • As a case of Black Comedy, on a Genocide run, you can say to that Froggit that you dislike yellow names, but you can also elect to keep them on regardless. The Froggit simply obliges and does not think about this at all.
  • Once Toriel gives you a cell phone, you have a few topics to call her up about. If you choose the "Call her 'mom'" option and then choose the "Flirt" option, she will take note of this and call you an "interesting child."
  • Napstablook has a couple:
    • When you first encounter them, they appear to be sleeping — but actually they're literally saying "z" repeatedly.
    • One of their "attacks" is just a harmless block of text that reads "REALLY NOT FEELIN UP TO IT RIGHT NOW. SORRY."
    • After cheering them up, they make a top hat out of their own tears which they call "Dapperblook".
    • Should you do anything but "cheer" for "Dapperblook," they resent it. A lot. And it's pretty much impossible to spare them by then.
    • If you reduce their HP to 0, they'll remind you that you can't kill ghosts, and reveal that they were only reducing their Life Meter to be polite. You win the fight and lose one experience point. (Which doesn't reduce your EXP at all.)
  • When fighting a Migosp, clearing out the other monsters changes its mood and its "attack" becomes a little animated Migosp silhouette doing an arm-waving dance. It stands at the bottom center of the arena and makes no effort whatsoever to attack your soul. But it's still a bullet, and running into it still hurts you.
  • In Hard Mode, rather than cooking you her signature butterscotch-cinnamon pie, Toriel will cook for you a snail pie! Made funnier by the fact she'll still ask you if you prefer cinnamon or butterscotch, but now it doesn't really mean anything.
    "Snail Pie" - Heals some HP. An acquired taste.
  • Hard Mode, for the most part, is pretty difficult, with upgraded enemies and the like. However, when you reach Napstablook, there's nothing different about them, and the game even comments that they're the "same as usual". Check them, and you discover why.
    NAPSTABLOOK - ATK 10 DEF 10
    Missed the memo and is the same difficulty as normal.
  • Using the Check Command on Toriel during the fight against her yields this little gem:
    ATK 80. DEF 80.
    Knows what's best for you.

     Snowdin 
  • Sans' Establishing Character Moment. He sneaks up behind you in the woods while shrouded in shadows, then tells you to turn around and shake hands. He has a whoopee cushion in his hand.
    • For that matter, the entire scene introducing the two brothers.
    Sans: maybe looking at this nice lamp will help you.
    Papyrus: SANS!!!
  • Sans explains that he's gotten a ton of work today — a "skele-ton". The camera zooms in, he winks at the player, Rim Shot. Papyrus gets mad at him, even though — no, because he's smiling.
  • Doggo can't see you if you're not moving. Petting him without him seeing you causes him to flip out.
  • Shortly before the fight with Dogamy and Dogaressa, you can find a sign reading "WARNING: Dog Marriage". Check it again, and you'll be informed "Yes, you read that correctly."
    • When you encounter them, they do a little dance accompanied by "Dogbass". It's out-of-nowhere as heck and amusing because of it.
  • Another one of Sans has him try to sell you fried snow near the ice cream vendor first for 5 gold, then 50g, then 5000. He says 50000 gold — which is almost impossible to have at this stage — is his final offer. If you don't have enough, he says he doesn't have any snow. (Even though he's completely surrounded by snow.) If you do have 50000 gold, well...
    Sans: Wow, that's a lot of gold, which is why i'm sad to say this snow has sentimental value.
  • Just try petting Lesser Dog. Pet it as much as possible. Its head keeps stretching out each time you do.
    • Lesser Dog's attack involves a dog barking and then jumping at you!
    • When the response reaches "Critical pet!", it stops attacking. But that shouldn't stop you from petting it. Eventually its head goes off-screen. Keep petting and its head reappears to stretch back down, passing through its speech bubble and the menu interface, off the bottom of the screen. While you're doing this, you get several humorous messages about the game questioning your decision to pet it so much. When the Lesser Dog's head goes behind the dialog box, the game states that it's learning how to read.
    • Also, if you pet it sufficiently, it gains inspiration and goes crazy with statue-making at its home a few screens later, which adds visual gags and some humorous dialogue from the bystander.
  • The Greater Dog. At first it looks like a non-anthropomorphic, kid-sized dog buried in a mound of snow. Then it rises up to full size in a towering suit of armor. Hopefully you're not too scared to spare it. It turns out to be a normal dog after all, jumping out of the armor to lick your cheek. Then it hops back into the armor face-first with its tail poking out the top and walks away.
    • The Greater Dog's attacks involve a dog lying on its back and barking at you!
    • Returning to Snowdin at a later point in the story and speaking to Doggo. He'll inform you that Greater Dog writes the most beautiful letters, despite not looking the type to do so and offers you a letter to see for yourself. The only thing written is the word 'Bark' written in a flowery cursive script.
  • When Papyrus sees you for the first time on the Pacifist Route...or, perhaps...not:
    Papyrus: SO, AS I WAS SAYING ABOUT UNDYNE...(turns to face you, he and Sans shoots several looks at each other) SANS!! OH MY GOD!! IS THAT...A HUMAN!?!?!??!?!
    Sans: (as the camera pans to the left) uhhh...actually, i think that's a rock.
    (sure enough, there's a rock right behind you)
    Papyrus: OH.
    Papyrus: OH MY GOD! *whispers* (IS...IS THAT A HUMAN)
    Sans: (yes)
    Papyrus: OH MY GOD!!!
  • The earliest "puzzle" of Papyrus' is an electrified, invisible maze. When you take a step into it Papyrus promptly gets electrocuted, causing him to throw a tantrum with Sans grinning. He's then told to give the electricity orb to you, so he walks through the maze, leaving footprints to show the way once you get it.
  • One of Sans and Papyrus' puzzles that are supposed to stop the hero is just a word search puzzle left on the floor. You can walk past without even looking at it, infuriating Papyrus. If you do stop to look at it, one of the words is a 16-letter nonsense word that's one letter off from the entire first row of the word search. And it still does nothing to stop you from walking right past it. Occasionally, the word search will feature an additional character named "Nightmare"...who's just a snowman with Ice-E's face on it.
    • Another puzzle after that is a randomly-generated tile maze with a ridiculously huge number of tile types with all kinds of different functions and interactions with each other. Once Papyrus activates the maze to shuffle it, the tiles start flashing dramatically until they form a straight line to the exit. Even better, he doesn't say anything when this happens — just stares at it for a second before slowly spinning out of the room.
    • Asking Papyrus to repeat his explanation of the tiles causes him to describe the effects again, except he mixes them up. He tries to correct himself, but eventually gives up and asks you to activate the maze and try it yourself, then leaves. The machine doesn't even work.
    • The tile puzzle as a whole becomes even funnier when you take into account something you don't learn until much later; the machine being used to set the puzzle (which is stated to come from Dr. Alphys) is actually Mettaton, meaning he has control over the puzzle's outcome. This changes the scene from Papyrus getting unlucky with technology to Mettaton deliberately screwing with Papyrus.
  • One of the features of Papyrus's trap gauntlet is a dog hanging from a rope. Not unhappily. Just chilling. It appears to be the Annoying Dog, making its being there at all look like it came out of Sitcom Arch-Nemesis shenanigans between itself and Papyrus after a first run.
  • When staying at the Snowdin Inn, the game fades out as you teleport to the hotel room. During this brief period, you still have control over the player character, so naturally, it's still possible to talk to the hotel clerk while it's still fading. Doing so nets this gem as a Freeze-Frame Bonus:
    What? No, you can't get a second key!
  • If you flirt with Papyrus during his battle, sparing him and telling him to be friends elicits this hilarious response:
    "WOW! WE HAVEN'T EVEN HAD OUR FIRST DATE AND I'M ALREADY IN THE FRIEND ZONE!"
    • Alternatively, if you choose the "what a loser" option rather than asking to be Papyrus' friend, Papyrus will think you're calling yourself a loser and suggest to become your friend so that you can be cool like him.
  • Sans warns you that Papyrus has a very "special attack" (in blue words), then explains that blue attacks won't hurt you if you don't move. After several fights involving those blue bullets, you finally get to see what was so special about Papyrus' attack:
    "YOU'RE BLUE NOW. THAT'S MY ATTACK!"
    • If you're paying close attention, Sans' dialogue uses different shades of blue for Papyrus' "special attack" and the regular light-blue attacks, so he technically wasn't lying.
    • Papyrus' ultimate attack isn't much better: It gets stolen by a dog. Papyrus settles for doing a "really cool regular attack", which includes a bone wearing sunglasses on a skateboard and the words "Cool Dude" spelled out in bones. The climax of the attack is a bone barrier so high that you end up jumping much higher than you could up to this point, and even raise the height of the Bullet Board in the process. Better yet, this epic barrage ends with a short bone crawling slowly across the ground.
    • If you completely fail to dodge Papyrus' attack after his special attack, he'll tell you to press up to jump!
  • Flirting with Papyrus
    Papyrus: So you finally reveal your ULTIMATE FEELINGS! W- Well! I'm a skeleton with very high standards!
    I have zero redeeming qualities
    Papyrus: OH NO! YOU'RE MEETING ALL MY STANDARDS!
  • Even on No Mercy, Papyrus' reactions to the player character as they refuse to entertain his puzzles is hilarious. It's possible for the player to choose Sans' word search as the one puzzle not to ignore completely. If you look at it, Sans declares that you can't be all bad if you like word searches.
    • Then there's also this reaction to you walking right through the aforementioned tile puzzle without even letting Papyrus explain it..
    Papyrus: HEY! IT'S THE HUMAN! YOU'RE GONNA LOVE THIS PUZZLE! IT WAS MADE BY THE GREAT ... ARE YOU SERIOUS?
    Papyrus: SANS!!! HELP!!! THEY KEEP WALKING THROUGH MY PUZZLES! THEY'RE SUPPOSED TO LET ME EXPLAIN THEM. THEN THREATEN AND BAFFLE THEM WITH DANGEROUS JAPES.
    Sans: well, maybe they don't like japes.
    Papyrus: EVERYONE LIKES JAPES!!!
    Sans: what about undyne? doesn't she hate puzzles?
    Papyrus: SHE HATES PUZZLES. BUT SHE LOVES JAPES.
    • On a No Mercy run, when Sans and Papyrus are first introduced, the player character doesn't go behind the conveniently shaped lamp, resulting in this exchange:
    Papyrus: SANS!!! HAVE YOU FOUND A HUMAN YET?
    Sans: yeah.
    Papyrus: REALLY!?!? WOWIE!!! GUESS THAT'S SETTLED!
    *Papyrus walks out.*
  • Once the fighting's over and done with, you can go out to lunch with Sans. First, he gets you with the whoopie cushion gag again. Then, if you ask him for ketchup, he pranks you by loosening the cap on the bottle. If you refuse ketchup, he instead drinks the entire bottle.
  • The initial encounter flavor text is hilarious whenever Jerry is involved.
    * Icecap and Snowdrake confront you, sighing.
    * Jerry.
    • One of the ACT commands you can do is "Ditch", which gets you and the other monsters to ditch Jerry for a few turns. If the battle ends before Jerry comes back, he will remain gone.
    • Jerry is the only monster you can leave alive on a Genocide run without reverting to Neutral, implying the Omnicidal Maniac you're playing as either finds it crueler to the monsters to leave him alive or doesn't want to deal with him long enough to kill him.
  • On No Mercy, the Fallen Child's willing to spare Jerry from the battle's start, which implies that even they think that Jerry's a greater evil and it'd be more worth it to let him run around. The other implication is that even they don't want to deal with him long enough to kill him. You'll also notice that killing Jerry doesn't decrement the remaining monster counter that you see at save points.
  • Lose to Papyrus in a fight and he'll lock you in their garage while waiting for Undyne to show up, saying you're in the doghouse now... upon waking up, you can find a note from him saying to make yourself at home and that he's provided accommodations and refreshments. All that's in there is an old dog bed, a bowl of dry dog kibble, and a squeaky bone. The door is also locked...from the inside. Papyrus is literally treating you like a dog, possibly because he has no idea how to handle a human in the first place. Lose to him again, and he promises to make the room so nice that you won't want to escape. He does this by... cutting up a hot dog into the kibble. Given how he has to deal with the Annoying Dog, this explains so much.
  • Killing Papyrus on a non-No Mercy run is funny in a dark way. Even better because he keeps his standard demeanor all the way through.
    *Papyrus' head detaches from his body*
    Papyrus: ALAS, POOR PAPYRUS!
    *Papyrus's body dissolves into dust*
    Papyrus: WELL, AT LEAST I STILL HAVE MY HEAD!
    *beat*
    *Papyrus's head dissolves into dust*
  • Aborting a No Mercy run by sparing Papyrus is equal parts this and Crowning Moment of Heartwarming.
    Papyrus: WOWIE!! YOU DID IT!!! YOU DIDN'T DO A VIOLENCE!!!
  • When you save after hiding from Papyrus behind a conveniently-shaped lamp:
    "The convenience of that lamp still fills you with determination!"
  • Use the stick on Papyrus, and he'll follow the dogs' example and bring it back (complete with it being in his mouth).
  • If you abandon a No Mercy run at Papyrus and go hang out with him, he'll start talking about how he was ready to use his special attack on you as a last resort, only to examine the box and notice his special attack's nowhere in sight.
  • The description from the Snowdin shopkeeper about how Papyrus and Sans came to town.
    Shopkeeper: If you get bored, you can always watch those two skeleton brothers running around. They just sort of showed up one day and...asserted themselves. The town's gotten a lot more interesting since then.
  • On No Mercy, there are various ways to accidentally screw up and go back to the Neutral route. Snowdin, however, has probably the strangest (and the easiest to accidentally do). Go into Snowdin Town without wiping out every enemy, and the save point will read "That comedian..." in the Fallen Child's red letters (as a warning that you aren't quite done yet). After this, if you go back and make the killcount hit zero remaining, you might get the save point message "The comedian got away. Failure." Why? You didn't kill Snowdrake. Yes, you can make the count hit zero without killing Snowdrake. Yes, this will force you back onto Neutral. And yes, Snowdrake of all monsters is the only one who can trigger this event.

     Waterfall 
  • The Bridge Seed puzzle. You can use the Bridge Seeds to access an island with a sign on it rather than trying to proceed to the next room. Reading the sign gives you this message:
    "Congratulations! You failed the puzzle!"
  • Meeting Napstablook again. They offer you a sandwich and invite you to sit on the floor with them and feel like garbage. Take them up on their offer and after a few seconds of laying there Napstablook's house fades away and is replaced with the universe. Apparently feeling like garbage is awesome.
    Joel: Hang on guys, I'm gonna go grab some coffee.
  • The Snail race. You're told to button mash to encourage your snail. Mash too hard? The snail freaks out and catches fire. If you win you get 9g. Entering the race costs 10g. Hey, Napstablook has to make money off the farm somehow! There's also a third outcome. If you lose the race by a small margin, your snail will think it won. The snail looks at you, expecting you to receive prize money, and Napstablook gives you 30G to avoid disappointing the snail
  • If you play one of Napstablook's spooky CDs and leave their house, the spooky music will persist in the next area. Eventually, you'll wind up in an encounter with Aaron and Woshua... who don't even try to attack you, because they're too freaked out by the spooky music. Aaron still has a winking emoticon on every line of dialogue.
    Woshua: ...if you're so scared, why do you keep winking?
    Aaron: THESE ARE WINKS OF FEAR ; )
    • How do you defeat Aaron non-lethally? Flex until he flexes out of the room trying to out-flex you.
    • Even funnier, once you've got him to swear off being a creep, you can "Shoo" Aaron which makes him leave for fear of being haunted again.
    • What's more, in the true pacifist ending credits, Aaron's description will be changed to "Paranormal Investigator".
  • Finding the hidden Temmie Village, home to Temmie, Temmie, Temmie, Temmie, Temmie, Temmie, and Bob.
    • In a meta example, Temmie Village is the only place where you can sell your items, because they're the only shopkeepers dumb enough to buy your garbage. Not only that, they'll buy things you bought from them, at a higher price. They're so dumb they'll offer you infinite money.
    • The shop sells you Temmie Flakes for 3 different prices, a cheaper one marked "(ON SALE)", and a more expensive one marked "(expensiv)". It's just torn up pieces of colored construction paper, but somehow heals 2 HP.
    • One Temmie in the village is looking after an egg waiting for it to hatch. Examining the egg tells you that it's hard-boiled.
    • One Temmie asks you if you're allergic to them. She then says she understands as she's allergic to them as well. Cue her face swelling up (all the while the music stopping to emphasize this fact).
      hOIVS!
      • Even better, in the Playable Epilogue this is the only line in Temmie Village that's unchanged.
    • The message you get from using the save point in Temmie Village:
      You feel... something. You're filled with detemmienation.
      • Read that again. "Detemmienation."
    • The Temmie shopkeeper actually has a "tem pay for colleg" option, costing 1000G. Should you take up her offer, she's as good as her word and quickly slides off to get her degree... and somehow manages to forget to take her face. It's just... floating there.
      • Extra funny when you realize that means that she spent her entire time at college without a face. She comes back quickly enough, so it's unclear how long she was "really" gone, but it's still hilarious to think about.
    • Should you encounter a Temmie in battle, leave the game open and go do something else for a few minutes. When you come back, Temmie will have vibrated her face off her head.
    • Before the 2016 patch, the encounter with Temmie displays its stats as ATK: 7 and DEF: -20. After the patch, the game forgoes showing its stats and instead displays "RATED TEM OUTTA TEM".
    • When selling things to the Temmie shopkeeper, sometimes she'll really want the item and offer you more money for it. If you reject both of her higher offers, she drops the Temmie-speak and says:
    • And if you do this after she goes to college:
    Is this a joke?
    Are you having a chuckle?
    Ha ha, very funny.
    I'm the one with the degree.
    Mushroom dance
    Mushroom dance
    Whatever could it mean?
    It means you've lived a life of sin.
  • Finding a mysterious artifact, only to discover, to your bewilderment, you can't even pick it up because you're holding "too many dogs". Entering your inventory will show there's suddenly an item called "Annoying Dog" that, when used or dropped, will fly up to the orb, absorb it, and leave behind Dog Residue. Using the Dog Residue does nothing but fill your inventory up with more Dog Residue (or a healing item called Dog Salad), and it has descriptions like "Jigsaw puzzle left unfinished by a dog." and "Dog-shaped husk shed from a dog's carapace."
  • Things related to the Mad Dummy:
    • First off, once you walk past the apparently inanimate dummy, the screen suddenly zooms in on his angry expression, complete with a certain musical sting you might be familiar with!
    • He tries to kill you because you beat up his cousin (aka the training dummy back in the Ruins). Unless you went the Pacifist route and either talked to it or waited until it flew off on its own, in which case he's trying to kill you because you said mean things or... you're really boring.
    • Attempting to talk with Mad Dummy will result in this rather amusing message:
    You attempt to talk with the Dummy... It doesn't seem much for conversation. Nobody is happy with this.
    • Mid-fight, you'll occasionally see this:
    "Mad Dummy is getting cotton all over the dialogue box."
    • After his mini-dummies and robo-dummies keep getting tricked into shooting him, he angrily ditches them all to move onto his final phase and proclaims "I don't need friends! I've got KNIVES!" and hurls a knife at the player. He then realizes he only had one knife, and the fight ends.
    • When he calls his mini-dummies out, they all appear at the edges of the bullet box...and appropriately gawk at him when he calls them useless, and slink off dejected when they're fired.
    • The way the Mad Dummy is animated makes little effort to make the sprites that go into his animations cohesive. By the end of the fight, he's flailing around so much that his head goes offscreen.
    • After the fight, you can find him again doubling as Undyne's training dummy. His response to being questioned about it is a bunch of Defensive Whats and "It's a living."
    • Before the patch in 2016, Mad Dummy's stats were ATK: 7 and DEF: -40. After the patch, this was changed to ATK: 30 and DEF: YES.
  • The pacifist run has you run away from Undyne at every possible moment. In the middle of trying to escape, you might get a hilarious phone call from Papyrus.
    "HEY! I THINK YOU AND UNDYNE SHOULD HANG OUT SOME TIME. YOU'D BE BEST FRIENDS I BET!"
    • You can receive this call even after killing Undyne, making it either a "Funny Aneurysm" Moment or even funnier, depending on how you look at it.
    • If you go back to the same spot later and call Papyrus and Undyne, Undyne will mention that she had noticed you had gotten a call, so she waited for you to finish your call before resuming her chase. Undyne also asks Papyrus what he phoned you for, for which he tells her: You, him and Undyne should all meet together sometime. Cue a priceless reaction from Undyne.
    • It's possible to turn around and go to Undyne's house immediately after getting the call. She'll chase you until where you meet her, but stops halfway. When you arrive, you'll meet Papyrus, who says that Undyne isn't there yet, but compliments you for coming.
    • During the chase, you'll eventually pass through a sleeping Sans on his booth. Undyne will actually stop chasing you briefly just to turn to and stare at Sans, no doubt angry that he's slacking off on his job. She'll even comment on it if you were to phone her within this area.
      • If you stay on that screen for long enough, you can actually see Undyne turn around with an outraged look on her face.
  • When you're humming with Shyren and monsters start to gather to listen, Sans starts selling tickets made of toilet paper.
  • The fight with Undyne includes a unique mechanic where you have to "face danger head-on" and block the incoming bullets. The first volley comes from the direction you're already facing. If you manage to get hit by it anyway, she'll explain more clearly that you're supposed to face the bullets. Repeating this will make her more and more frustrated, until she finally gives up on having a "fair fight" and throws a much more difficult attack at you.
    "WHAT ARE YOU DOING? JUST FACE UPWARDS!!! IT'S NOT HARD!"
    (Player gets hit. Again.)
    "I wanted this to be a fair fight. I thought if I beat you like this... It'd truly show how strong monsters can be.
    BUT NOW??? I DON'T CARE! I'M NOT YOUR FREAKING KINDERGARTEN TEACHER!"
    "Unless your Kindergarten teacher...
    "DOES THIS!!!!!!
    • She then throws an attack harder to dodge than any of her Undying version's attacks.
  • When Undyne introduces herself, she starts talking exposition, only to just go "Screw it" and start boasting that it doesn't mean squat since she's going to kill you, her boss music even plays in sync with the text. This will only happen if you're doing a pacifist run.
    • Her speech about killing the player character comes complete with dramatic posing/angles and her randomly yelling some of her lines. It's a perfect example of her Hot-Blooded-ness and sounds like something straight out of a shonen anime.
    • If you call her later, she'll actually explain the real reason she stopped expositing. She forgot her lines.
  • This gem from Undyne's battle:
    "Undyne suplexes a huge boulder, just because she can."
    • Even better:
    Undyne suplexes ten huge boulders, just because she can.
    Undyne suplexes herself, just to prove nothing is impossible.
  • You can ditch Onion-san by saying his band won't be popular. The way he reacts to this is just too funny to dismiss and has no impact on a Pacifist run.
  • If you go to Undyne's house on a run in which you've killed at least one monster up to that point but spared both her and Papyrus, the latter will be waiting at her door as usual and tell you that when he asked Undyne if she'd like to hang out with the two of you, she said she wouldn't hang out with a murderer... which has him worried, because he can't remember murdering anyone!
  • Sometimes, when you flee from a battle, you'll get "I've got better to do" instead of the usual "Escaped." Since you have to flee from Undyne in order to end the battle peacefully, it can be funny to see the former as you're literally running for your life.

     Hotland 
  • The folks of Hotland deem it necessary to welcome visitors with a huge neon sign that scrolls the phrase "WELCOME TO HOTLAND!"
  • As you walk through Hotland, you can find Sans manning a hot dog...? stand.
    • If you don't have any room to buy one, he'll put it on your head like a hat. You can have him put up to 29 hot dogs on your head before he says "Do I look like I can reach that high? 29's the limit." If you move, the hot dogs on your head will start raining down.
    • After buying a couple hot dogs, Sans will say he ran out and sell you a "hot cat" instead. You can keep buying more hot dogs after that, with Sans commenting that "you really like hot animals, don't you?"
    • Check the first hot dog you get. It's something called a "water sausage", IE. a cattail frond. He just tricked you into buying part of a plant.
  • If you check the entertainment schedule in the hotel restaurant, you'll see that it lists "comedians" and "Sans" as separate features.
  • The only non-Check Act you can do in Mettaton's quiz "battle" is to "Cry." If you do so, the flavor text will inform you that "screaming is against the rules."
  • The first of Mettaton's question is worth a good chuckle if you pick a wrong option:
    Mettaton: Let's start with an easy one!
    Q: "WHAT'S THE PRIZE FOR ANSWERING CORRECTLY?"
    A: Money
    B: Mercy
    C: New Car
    D: More Questions
    Mettaton: (zapping the player's SOUL) Hahaha, you wish! Wrong!
  • Would you smooch a ghost? The time starts counting up, and all the options presented to the player are HECK YEAH. Alphys, who up until this point has been standing off to the side and quietly giving you the correct answers with her hands, just sits there utterly bewildered. Even the sound of "correct answer" is comically distorted to fit the mood.
  • Some of Mettaton's questions when he starts unleashing his inner Troll. Examples include asking you to name the creature when showing you part of a Froggit on a shirt Mettaton is wearing, so the answer is actually "Mettaton" and how many letters are in the word Mettatonnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn, with the word length and answer numbers increasing simultaneously.
    • The fact that Alphys is somehow correctly giving the answers to Mettaton's Troll questions is hilarious until you learn that she's been rigging most of the Hotland stuff, anyway. Even then, the fact that she gets those right but still looks annoyed at the "Would you smooch a ghost?" question is pretty funny.
  • For the final question, Mettaton decides to ask something Alphys would never give you the answer to: Who does she have a crush on? You can pick the correct answers (Undyne or Asgore) or you can pick yourself. The bewildered look Alphys gives you is almost worth the embarrassment. Mettaton decides that, while wrong, your sheer conceit is worth giving you a pass. You can even say you don't know who she has a crush on, which results in Mettaton making a plea to a hypothetical crush to give everyone watching a sign that they're out there. No sign happens.
  • During the following dungeon, Alphys offers you puzzle hints. And updates her social network page constantly. Some highlights include:
    Alphys: Cute picture of me! [Attached is a picture of a trash can with several glitter filters applied.]
    Alphys: dinner with the girlfriend ; ) (It's a picture of a catgirl figurine next to a bowl of instant noodles.)
    CoolSkeleton95: ARE WE POSTING HOT "PICS???" HERE IS ME AND MY COOL FRIEND (It's a picture of Papyrus flexing in front of a mirror.) (He is wearing sunglasses.) (Giant muscular biceps are pasted onto his arms.) (The biceps are also wearing sunglasses.)
    • The picture Papyrus posts is given its full visual glory through Steam's Trading Cards.
    • Another update has her ranting about how the sequel to her favorite anime ruined the story arc before remembering she was supposed to be helping you. This occurs right next to a Save point, which refers to the room as Bad Opinion Zone.
    • At one point Alphys tells you to add her as a friend on said social network, before remembering that you're already friends. She set up your account for you. And you've seen all of her status updates, like the ones where she's psyching herself up to call you and later saying that she's not going to help you on puzzles anymore after she messed you up on one with her help. Oh yeah, and all of her nerdy anime posts.
  • Mettaton's musical number is a blatant parody of the opera scene from Final Fantasy VI, even using the same singing "voice". For bonus points, the name on the game window changes from Undertale to Undertale: The Musical for this scene.
    • The song itself is pure gold.
      Oh my love
      Please run away
      Monster King
      Forbids your stay
      Humans must
      Live far apart
      Even if
      It breaks my heart
      They'll put you
      In the dungeon
      It'll suck
      And then you'll die a lot
      Really sad
      You're gonna die
      Cry cry cry
      So sad it's happening
      Mettaton: So sad that you're going to the dungeon. Well, toodles! (Pushes a button on a remote to open a trap door under you.)
    • In the "dungeon", Mettaton pits you against an actual working version of Papyrus' color puzzle, where stepping on a yellow tile zaps you, green ones make you fight monsters, etc. And he keeps singing.
      Oh my love
      Has fallen down
      Now in tears
      We all will drown
      Colored tiles
      Make them a fool
      If only they
      Still knew the rules
      Well that was
      A sorry try
      Now let's watch
      Them fry
    • If you don't move and let the timer run out, Mettaton starts on his usual explanation of what the tiles do before realizing you never stepped on a green tile, and therefore aren't required to fight him.
    Mettaton: Well, darling! Well, well, well. Welly well well. Well welly well well. Well well welly. You never stepped on a green tile.
    Mettaton: And now you're going to die.
    • In this fight, you get to learn how to use Yellow SOUL mode, which makes your SOUL yellow turn, upside down, and shoot lasers. After hitting Mettaton a couple times:
    Mettaton: Oooh! Oooooooh! You defeated me! How can this be, you were stronger than I thought, etc. Whatever. (pisses off)
    Alphys: Wh-wh-what? TH-THAT puzzle? I mean, uhh... Great job! We've got him on the ropes, now!
    • It's hilarious seeing Mettaton having to prompt Alphys to rescue you.
  • Attempting to sell something to Burgerpants before befriending him results in his smile becoming extremely strained and his sprite shaking violently as the text "(WHY IS THIS PERSON TRYING TO SELL ME SOMETHING THIS IS A HAMBURGER RESTAURANT I'M JUST TRYING TO SURVIVE)". The parenthesis indicate that he's holding his incredulousness in to avoid a reprimanding from Mettaton, however if you attempt to do this again he throws caution to the wind and shouts "WHO DO YOU THINK YOU ARE".
  • Another rare moment of hilarity during the No Mercy run occurs if you visit MTT Burger and find that Burgerpants (whose detailed expressions are hilarious no matter what run you're doing) is still manning the counter because Mettaton is so much of a Bad Boss, he has no idea if he's allowed to leave work during the evacuation.
    Burgerpants: If I don't play it safe, he's going to yell at me. ...okay, maybe "yell" is the wrong term. It's more like he has this... CD Album he plays... that's entirely full of songs about how bad I am at my job.
  • In the No Mercy run, if you threaten Burgerpants, he gives this memorable line:
    Burgerpants: Sorry, little weirdo, threats won't work on me. I can't go to hell. I'm all out of vacation days.
    • Upon meeting him for the first time in a No Mercy run, he'll say this:
    Burgerpants: (Why do I always get the freaks?)
  • If you try to visit Bratty and Catty during the No Mercy run, you will stumble across the usual "Nobody Came" message... which is actually a note written by them:
    Bratty: But, like.
    Catty: Nobody came, and stuff.
  • During Mettaton's cooking show, he tells his viewers to remember to pre-heat their ovens.
    • If you examine the oven in the corner of his kitchen, you'll notice that he forgot to pre-heat it. Of course, since this is a cooking show Mettaton already had a cake made in advance.
    • When Alphys calls right as Mettaton is about to remove the human's soul (with a chainsaw):
      Mettaton: Hello...? I'm kind of in the middle of something here.
      Alphys: W-wait a second! Couldn't you make a... Couldn't you use a... Couldn't you make a substitution in the recipe?
      Mettaton: ...A substitution? You mean, use a different, non-human ingredient?
      Alphys: Um, what if someone's... Vegan?
      Mettaton: ...Vegan.
      Alphys: Uh well I mean—
      Mettaton: That's a brilliant idea, Alphys!
    • If you examine the death lasers on either side of the room, it gives this hilarious quote.
      (As per culinary standard, a death forcefield surrounds the kitchen.)
    • The fact that Alphys installed a jetpack function into your cellphone!
  • There's one area on a conveyor belt where you see a cactus off to the side; if you examine it, you get the message "You stop to smell the flowers."
  • When you reach the area where Mettaton is giving a news report, you can walk around and examine items in the room, only to learn that the item you just picked up is, in fact, a bomb. Mettaton then tears down the walls around him to reveal that all of the other objects you didn't examine are also bombs — the present, the basketball, the script for his newest movie...even the words in his speech bubble!
    • Examining everything more than once nets some snarky comments from Mettaton. But the one for the present takes the cake:
      Mettaton: Ready for your...presentation? (...let's cut that one in post.)
    • Before that, some of the news themselves are actually pretty hilarious.
    "Scientist discovers the health benefits of using computer (just kidding lol)."
    "Local Mettaton very rich famous and gorgeous."
    "Tiny Volcano Monster tries its best, receives tiny applause."
    "Local plane creates huge line at store by saying "It's not like I actually want to buy these products or anything." Cashier confused."
  • If you choose to attack Mettaton EX directly, he makes an...interesting face.
    • Not only that, he'll also say "Yeah!" in a whispery sexy voice each time you hit him!
  • During the battle with Mettaton EX, you may occasionally get text that just says "Mettaton." to start off the round, as if even the game doesn't know how to process what's going on. Another possibility is "Smells like Mettaton."
  • Mettaton will actually interrupt his broadcast/attempt to claim your soul just so they can have a union-regulated break and do so with a complete straight face. Yes, you actually get a break — no killer robot bombs or electrical bolts for five seconds.
    HAPPY BREAKTIME
    • The bubbly font used for the break text is hilarious, if only because of how much it stands out from the game's usual font.
  • As with Papyrus, if you have the Stick in your inventory for Mettaton's EX boss fight, you can throw it for him. He'll catch it in his mouth in midair and wink, resulting in a Ratings boost for "fetching".
  • How the fight with Mettaton EX even starts is golden. He's normally invincible while in his standard box form, so how do you get him to turn around so you can hit his switch? Frisk tells him that there's a mirror behind him, and Mettaton immediately falls for it.
    • If you die during the fight and come back, you have the option of skipping Mettaton's opening speech by turning him around immediately. Frisk tells him there's "something cool" behind him, and Mettaton again falls for it instantly.
  • Also on the No Mercy route, after the awe-inspiring hell of Undyne the Undying, the boss fight against Mettaton NEO is... hilariously anticlimactic, especially since he gets a menacing-looking new form, theme music drawing similarity to Undyne the Undying's theme, and builds up his human-killing capabilities, only to die in a single hit.
    Mettaton NEO: GH... Guess you don't wanna join my fan club...?
    • If you don't meet the requirements to continue No Mercy, Metatton NEO notes as he dies that "You were holding back"... and then notes, "And so close to the end, too!" The game itself mocks you for blowing the No Mercy run at the last minute.

     Making Friends 
  • "Dating" Papyrus. You get to poke around his house (which is full of funny lines in and of itself) but the best part is getting to engage in a "battle" with Papyrus in which you prove to be the ultimate dater.
    • The "Dating HUD", which shows the current day of the week, alongside some hilariously unnecessary interface elements such as a dog radar, a "Crime" map, a "Population" graph that keeps fluctuating, a "Reel It In!" meter (presumably for fishing), and an egg.
    • In Papyrus' kitchen, inspecting the extremely tall sink prompts him to show you the bone collection he stores under it. The cabinet is opened to reveal that the Annoying Dog has emptied it of its contents. You barely even get to move before the dog successfully escapes, followed by a mocking sting courtesy of Sans' trombone. Repeat: a trombone.
    Papyrus: SANS! STOP PLAGUING MY LIFE WITH INCIDENTAL MUSIC!
    • Quickly walk in and out of the kitchen in the skeleton brothers' house. Since Papyrus follows you as you go in/out, he'll be walking back and forth. After a while you'll hear a "ping" noise every time he changes direction. Talk to him, and he'll mention that being a good host is a workout. Keep walking back and forth until the sound changes, talk to him again, and he'll tell you that he can't feel his legs...which must mean that he's a great host.
    • When Papyrus shows up in his "cool" outfit, it's revealed that he has a plate of spaghetti under his hat. Papyrus's obsession with spaghetti in general is hilariously Adorkable — even more so when you consider that skeleton-made spaghetti might be called creepypasta.
    • Looking at the book on the table in Papyrus and Sans' house during the "date" reveals an infinite loop of quantum physics and joke books inside one another until you decide you need to stop.
    • In Papyrus's living room, there's a sock with a long trail of sticky notes above it. Checking it shows just how big a Troll Sans is, tormenting his brother through gratuitous use of Exact Words.
    Papyrus' note: SANS! PLEASE PICK UP YOUR SOCK!
    Sans' note: ok.
    Papyrus' note: DON'T PUT IT BACK DOWN! MOVE IT!
    Sans' note: ok.
    Papyrus' note: YOU MOVED IT TWO INCHES! MOVE IT TO YOUR ROOM!
    Sans' note: ok.
    Papyrus' note: AND DON'T BRING IT BACK!
    Sans' note: ok.
    Papyrus' note: IT'S STILL HERE!
    Sans' note: didn't you just say not to bring it back to my room?
    Papyrus' note: FORGET IT!
  • Papyrus's plan to make Undyne and the protagonist friends.
    • First he gives her a gift-wrapped bone on behalf of his guest, saying it's her "favorite thing," and she awkwardly accepts and puts it in a drawer full of them. Then he gets out of practice by claiming he needs to go to the bathroom, and immediately leaps out the window. Finally, when she refuses to be the protagonist's friend, he shows surprising cleverness by suggesting she's simply not up to the challenge. With that, she reverses her attitude, determined to become "besties" with you. If you then examine the window, Undyne will mention that she was surprised by Papyrus' window jump... because he normally nails the landing.
    • When Papyrus leaps out the window, the resulting glass shards wind up inside the house.
    • You can look inside the bone drawer. The Annoying Dog is inside. He winks and slides the drawer shut again.
    • Once Undyne realizes who you are, if you look closely, her dialogue sprite glances over at Papyrus as if she's thinking "Are you freaking kidding me dude?!"
  • After seeing her trudge around in her huge armor, it's amusing to find that Undyne is actually really thin and lanky.
  • During Undyne's friendship-making:
    • The game turns her questioning whether or not you're really trying to make friends with her into a But Thou Must! — even if you say "NEVER with you", she still forges ahead. That's right: say yes and she'll wind up making friends with you to spite Papyrus; but say no, and she'll wind up making friends with you to spite you.
    • Undyne offers the player several drinks, with Tea labeled as "the blatantly correct choice". Hilarity Ensues when the player picks anything else, including Undyne's sword and Undyne herself.
    • At first, the protagonist is seated and then asked to choose a drink. As soon as you press ANYTHING, Undyne smashes the table in half with an energy spear and shouts at you to stay still. You're her guest, so SIT DOWN and she'll grab your beverage.
    • She then decides to teach the player how to cook in an effort to make them closer. What happens next would fit perfectly in an episode of Regular Ordinary Swedish Meal Time...
      • If you opt to punch the vegetables into sauce in a "wimpy" manner, she yells at you to "STOP PETTING THE ENEMY!!!" Especially hilarious given how you'd have to have gotten to this point to begin with.
      • If you opt to punch the vegetables, you knock over a single tomato. It's not even scratched. Undyne gets hyped anyway. Right before that, she doesn't lead the Kid to the kitchen top; she jumps next to them, grabs them (holding them horizontally by the head, one-handed), jumps again to the kitchen top, and places them in position. What makes it even more hilarious is how the player character's face never changes beyond the default expression.
      • During the sequence where you're supposed to hold right to turn up the stove, pressing left results in Undyne saying "Left? Fool! THIS BURNER ONLY GOES ONE WAY!". Specially hilarious when you consider how the lesson ultimately turns out.
      • But what if you add that scene with this scene from Spongebob Squarepants? The result is actually quite fitting...
      • The whole thing ends with Undyne getting so carried away with cooking at full power that she accidentally burns her house down. Her house is still burning even during the Playable Epilogue. Made even funnier if you decide to inspect the still-burning house—"Sounds like only fire lives here now."
      • Call Papyrus immediately after Undyne leaves. Just as he picks up, Undyne shows up at his house out of breath. It turns out she ran all the way to his house so she could be part of the phone call. Call them again and Papyrus assumes that she must have something extremely important to say about her house since she wanted to make sure that she's be present when you call them, to which she simply replies "Nope!" with a huge grin on her face.
      • Between burning the house and escaping it, Undyne declares her friendship with you a failure and that her only way to regain her pride now is a fight to the finish with you. When the battle engages, you can either FIGHT or "Fake Attack" (your only ACT option besides the usual "Check"), which both lead to a dramatic build-up...to Undyne just losing one HP. Her reaction is priceless.
      • And then you can go check on Papyrus and Undyne outside of Papyrus and Sans' home.
        Undyne: Heya, punk! (sneezes) Papyrus, how can you stand this cold?
        Papyrus: I HAVE NO SKIN.
        Undyne: So why don't we stand in Grillby's instead?
        Papyrus: BECAUSE I HATE GREASE.
        Undyne: But you don't have a stomach!!
        Papyrus: NO, BUT I HAVE STANDARDS!!!
      • And after that:
        Undyne: Papyrus, why do you live in an icy wasteland?
        Papyrus: THE RENT'S CHEAP.
        Undyne: Really? Don't you live in a huge house?
        Papyrus: YEAH, BUT MY BROTHER PAYS FOR IT.
        Undyne: (gawking) Where's your brother get the money to pay for it?
        Papyrus: OH, THAT'S SIMPLE. IT'S A MYSTERY.
  • The date with Alphys, while initially hidden, is one huge laugh riot.
    • Even before the date, you can trigger a Crowning Moment of Funny by getting Undyne's letter and tossing it out. It turns out that if you had delivered Undyne's letter to Alphys, it would have been a bad idea. So, in the meantime (which could be less than 15 seconds if you're quick), she wrote an even better letter, called "Undyne's Letter EX!" The only difference is that it has "DON'T DROP IT" written on it. If you try to toss this one, it turns out that it's too powerful, and it gets the better of you. A piece of paper in an envelope gets the better of you.
    • You can also attempt to mail Undyne's letter to Papyrus. The resulting dialogue:
    Undyne: Oh my god! The letter's not to PAPYRUS!!!
    Papyrus: YEAH, UNDYNE'S GOT A POINT! WHY DIDN'T SHE WRITE A LETTER TO ME INSTEAD?
    Undyne: Fine, you want a letter!? I'll give you a letter!!! YOU GET AN "F"!
    Papyrus: OH NO!!! WHAT'S THE F FOR?
    Undyne: Friendship!!!
    • It starts with Alphys taking you to her favorite place (a garbage dump) and being completely unable to manage small talk (the best she can do is asking if you like anime).
    • Before the date, if you try to open the letter from Undyne, you notice it's too tightly closed, and may require a chainsaw to do so. When you slip the letter under Alphys's door, you hear her opening it with a chainsaw. Not to mention, if you try to open the letter from anywhere within Snowdin, Undyne will yell at you for it.
    • You can help Alphys overcome her fear of talking to Undyne by roleplaying with her. You can either pick realistic responses... or pick answers that sound like a bad internet roleplay. Complete with misspellings and poor grammar. The best part is that after the two choices, she gets wayyyyy too into it and begins shrieking and hollering her answers, which manages to alert Undyne to her position.
    Hi Undyne! Can we talk?
    Yo your one hot hotbaby
    • Undyne shows up on the scene and the two reconcile. Undyne then resolves to help Alphys with her confidence issues and embraces her. Then she picks Alphys up and tosses her through a basketball hoop into a trash can!
    • Papyrus' appearance in the latter half of the event. Sure, it's only for about ten seconds, but what a ten seconds it is!
    Papyrus: IT'S TIME TO JOG 100 LAPS, HOOTING ABOUT HOW GREAT WE ARE!!!
    • Just their entrance alone is enough to make one burst out laughing. Undyne gives an incredulous "Pffft, what? ME?" to the idea of training Alphys, and then right on cue Papyrus sloooooooowly rises up out of a pile of junk with the same shit-eating grin he always wears plastered across his face, wearing some ridiculous-looking sporting attire, including a tank-top with "JOGBOY" written on it. Alphys' expression paints an absolute picture.
    • Finally, Undyne, now alone with you, promptly begins freaking out about Alphys saying that the historical books and movies were just fictional comics and anime. What follows is the funniest, but hardest moral choice in the game. Undyne's theme playing at a ridiculously fast speed during this part somehow makes it even funnier.
    Undyne: (with an insane look on her face) ANIME IS REAL, RIGHT!?
    Anime is real — HA HA HA!!! I KNEW IT!!! GIGANTIC SWORDS!!! MAGICAL PRINCESSES! HERE I COME!!!
    Anime is NOT realNo...NO!!!! I CAN FEEL MY HEART BREAKING INTO PIECES!!!

     Final Area and Endings 
  • After defeating Asgore, he gives a forlorn Final Speech/Motive Rant and the FIGHT and MERCY options pop up. Amusingly enough, the MERCY button looks like it's been hastily pasted back together after Asgore smashed it at the start of the fight.
  • Another rare couple moments of humor along the No Mercy path comes when you reach New Home, right before things take a turn for the absolute worst. While at Toriel's house, visiting the kitchen can prompt red text to chillingly demand "Where are the knives." Equipping the Real Knife gives text reading "About time." Looking in ASGORE's fridge prompts the similar red text to declare "No chocolate." Is the Fallen Child craving sweets?
  • Photoshop Flowey/Omega Flowey will at first shrug off any damage you give him with a simple "Ow!~". However, as you injure them more, this quickly devolves into pained and distorted screaming.
  • At the end of the final fight on the Neutral path, when fighting Photoshop Flowey, reducing his HP to 0 makes him start to go into a typical everything-exploding death, with the requisite Big "NO!"'s... before he abruptly loads the game back to the start, the explosions cutting off instantly with a simple "PING!" noise. The utterly hilarious Trollface he makes at this point just seals the deal. After this happens, Photoshop Flowey monologues about how you're going to die alone while you have a ring of bullets around you. If you completely ignore him and persist in ramming into the wall of bullets long enough, Flowey will say "Would you STOP that?" He even changes the image on the television to his normal form to show how annoyed he is.
  • If you complete a Pacifist Run up to Asgore at Flowey's suggestion, then kill the king, Flowey will be utterly baffled (at first, anyway):
    Flowey: So you went the whole way through without killing... And then you decided to kill ASGORE? What the hell is WRONG with you?... Are you trolling me?
  • The look of dumbstruck panic on Photoshop Flowey's face when his save file fails to load, complete with his eyes on his otherwise creepy Nightmare Face staring directly at the "LOAD FAILED" text in the corner of the screen.
  • As horrifying as the No Mercy path is, the fight with Sans manages to have a laugh if you actually try to spare him when he lets you. The sped-up "Dogsong" in the background seals the deal even further.
    geeettttttt dunked on!!!
    • Sans is a pretty hard boss. When you walk up to a rematch, he'll make fun of you:
      you look frustrated about something. guess i'm pretty good at my job, huh?
      hmm. that expression... that's the expression of someone who's died twice in a row. suffice to say, you look really... unsatisfied. all right. how 'bout we make it a third?
      that's the expression of somebody who's died thrice in a row. hey, what comes after "thrice", anyway? wanna help me find out?
      that's the expression of somebody who's died quice in a row. quice? frice? welp, won't have to use it again anyways.
      that's the expression of someone who's died five times in a row. convenient, huh? that's one for each finger. but soon... you'll need a cool mutant hand to count all of your deaths.
      that's the expression of someone who's died six times in a row. that's the number of fingers on a mutant hand. you'll need to find a mutant hand with even more fingers.
      that's the expression of someone who's died seven times in a row. hey, that's good. seven's supposed to be a lucky number. who knows, maybe you'll hit the jackpot... and that number will multiply tenfold.
      that's the expression of someone who's died eight times in a row. that's the number of fingers on a spider. wait, don't spiders have legs?
      that's the expression of someone who's died seven times in a row. nope, wait, that's definitely nine, sorry. or was it ten?
      that's the expression of someone who's died ten times in a row. hey, congrats! the big one-oh! let's invite all your friends over for a big shindig. we can have pie, and hot dogs, and... hmmm... wait. something's not right. you don't have any friends.
      that's the expression of someone who's died eleven times in a row. well, give or take. there's nuance to this stuff. don't think i'll be able to count very well from here. count for me, ok? we'll start from 12.
    • Reaching the halfway point again after getting dunked on:
      ''whoa, you look REALLY pissed off... heheheh... did i getcha?
    • Additionally, the first time you reach that point, he gives a long, impassioned speech about how he can tell there's some part of you that wants to do the right thing. After you fall for it once, he changes it to a hilariously halfassed "friendship... it's really great, right? let's quit fighting", presumably realizing you're unlikely to fall for it again.
    • During the Interface Screw in the second part of the battle where staying in the menu can do you serious damage, one of the messages that pops up is "Reading this might not be the best use of your time."
  • Some rare moments of humor in the True Lab area:
    ENTRY NUMBER 20: ASGORE left me five messages today. four about everyone being angry. one about this cute teacup he found that looks like me. thanks asgore.
    i spend all my time at the garbage dump now.
    it's my element
    • The vending machine gives out "Popato Chisps".
    • The fight with Endogeny, one of the Amalgamates, is pretty frightening at first, and has unsettling music. As you keep taking actions in the fight, Endogeny will start to vibrate rapidly, and the music starts speeding up. You'd fully expect the worst to happen eventually... but when you've done everything you need to Spare it, Endogeny stops attacking and shaking, gains tiny, content faces on the dog silhouettes on its body, and the music switches to a rendition of "Dogsong", one of the silliest songs in the game. It's a jarring shift, but given what's been going on, it's a nice bit of humor before things start getting worse.
  • In the True Pacifist route, when all the bosses are gathering to defend you against Asgore for the final fight, there are quite a few:
    • Asgore's reactions to Toriel's "The Reason You Suck" Speech, and looking like he's about to cry when she rebuffs his attempt at reconciliation.
      Asgore: Tori... You came back...!
      Toriel: Do not "Tori" me, Dreemurr!
    • Undyne tries to cheer Asgore up, and Alphys says he should look for "a really cute fish".
      Undyne: Hey Asgore, is that your ex?
      Asgore: (sporting an OH. MY GOD. expression)
      Undyne: Jeez...that's rough, buddy.
    • Mettaton pipes in from off-frame and tells Alphys and Undyne to just kiss already.
      Mettaton EX: Oh my god!! Will you two just smooch already!? The audience is dying for some romantic action!!!
      Asgore, Undyne, Alphys, and Papyrus: O_O
      Sans: :D
      Undyne: HEY, SHUT UP!!! Man, the nerve of that guy! Right, Alphys!?? ... Uh, Alphys?
      Alphys: ... No. He's right. LET'S DO IT.
      Undyne: ?????????? Well??? Uh??? I guess??? If you want to??? Then??? DON'T HOLD ANYTHING BACK!
      (Undyne and Alphys lean in to kiss....which is ruined by Toriel suddenly diving in between the both of them)
      Toriel: W-wait! Not in front of the human!
    • The scene's even funnier if you imagine that Alphys pulled the same stunt she did throughout Hotland and programmed(or just told) Mettaton to say that so she'd have an excuse to kiss Undyne.
  • Getting the Golden Ending allows you to sit in on all of your friends, including Asgore and Toriel, as they casually chat about the future ahead of them. What follows is some of the best dialogue in the game.
    • Asgore finally gets to give you that cup of tea he offered you before you fought. It's unfortunately gotten cold.
    • Asgore also apologizes to you for trying to kill you.
    Undyne: Hey, don't worry about it, ASGORE. I think everyone's tried to kill Frisk at least once.
    Asgore: Oh... I see! In that case, I'm not sorry, Frisk.
    Undyne: [with a goofy grin] ASGORE! That's not what I meant!
    • If you refuse Asgore's cup of tea, Undyne leaps in to defend him.
    Undyne: Frisk, stop! You're breaking his big, burly heart!
    Asgore: Um, it's ok, Undyne. My heart's already broken.
    Undyne: ASGORE! STOP! YOU'RE BREAKING MY BIG BURLY HEART!
    Alphys: Y-yeah, Asgore. Don't break Undyne's heart. (Sly aside glance) That's my job.
    Undyne: OH MY GOD! YOU'RE GOING BACK IN THE TRASH!!!
    • Other characters then decide to join Alphys in this hypothetical trash can. Including Toriel, who changes her mind once Asgore wants in.
    • Toriel's Precision H Strike, which she quickly apologizes for and changes to "heck". Alphys's shocked reaction is almost as funny.
    • Alphys getting excited about seeing the world... before admitting that she's just going to go back to being a shut-in and watching anime.
    • Alphys and Undyne talking about how they're going to watch anime on the human internet, with Alphys insisting this was what they were fighting for all along.
    • Alphys introducing Asgore to anime, which the player can choose to describe a "like a cartoon, but" either "With Sword's" or "With Gun's." And, by accident, Alphys shows some Rule 34 material on her phone to everyone.
    Asgore: Golly. Were those two robots ...
    Undyne: ... kissing?
    Asgore: Boy! Technology sure is something, isn't it?
    • In addition, if the player had both previously called Toriel "mom" and flirted with her in the Ruins, she will comment on it:
    Toriel: Did I ever tell you about the time Frisk flirted with me...?
    Toriel: After calling me "Mom"?
    • If the player calls Toriel "mom" without flirting with her, instead, Sans will tease them over doing it when they'd just met her, leading here:
    Sans: i gotta tell ya... that's, uh, not the best way to get to know someone.
    Papyrus: IT'S NOT???
    Undyne: Papyrus, we've been over this!
    Papyrus: WHATEVER, MOM!!!
    Undyne: Don't talk back to me like that! Go to your room, Papyrus!
    Papyrus: OK, UNDYNE.
    Undyne: Wait! Don't ACTUALLY go to your room!
    Papyrus: I'M GETTING MIXED MESSAGES HERE!!!
    • Sans messes with Toriel while using her cell phone to text you:
      Sans: hey frisk. it's torrrrieelllll. i just baked 100000 pies. do you want any? make sure to brush your teeth before crossing the street.
      On the next message...
      Toriel: I did not say any of that.
    • After Sans "transcribes" Toriel's text, they impersonate each other.
    Toriel: Greetings. This is Sans. I love my brother very much.
    Sans: help i'm being slandered
    • On the next message, Toriel messes with Sans by typing this:
    Toriel: This is Sans. Did you know that I love to "get owned?" I also think Toriel is very good and fhfkehfeaufsisf
    • On a bet from Papyrus, Undyne lifts the entire main cast... and then is unable to figure out how to put them down.
    • In the final battle, not only the main cast, but almost every single minor character play a role in the outcome... except Napstablook, because when Asriel started absorbing everyone's souls, they escaped by shutting the doors and blinds to their house and ignoring everything that was happening. Because of this, they're the only one who didn't mysteriously learn Frisk's name. Napstablook sheepishly asks for that information, then tries to memorize it by crying the letters onto their hand, which immediately pool into an illegible puddle. What's probably even funnier is the fact that Asriel's soul-sucking apocalypse politely knocked at the door and then just left when Napstablook didn't answer.
    • In the Playable Epilogue, Dogamy and Dogaressa wonder if their marriage is now proper since the amalgamation of all the parents of the dog monsters technically makes them related. They then shrug it off, noting, "it's normal for dogs".
    • At one point, Toriel will express her disbelief that anyone would want to flirt with her. Alphys then has a fit of laughter before they say that she has no idea, while giving a knowing smile right at the player. That's right, Toby noticed all the naughty images people made of poor old Toriel and nodded to it in the game, yet did not outright do a Take That against the partakers of such images.
  • In a bit of Black Comedy, if you do your run in such a way that you kill every boss but left the monsters alone, you get a call from Sans. He informs you that without any leaders, the underground fell into chaos. That is, until a dog sat on the throne. The newly appointed dog king does nothing but sleep all day and the world below has been in a state of perfect peace ever since. Judging by the fact that "Dogsong" plays during this call, it's highly likely the dog that took over was Annoying Dog himself.
    • A slight alteration. If you kill every boss except Papyrus, Sans explains that the monsters were in such need of a leader that Papyrus was chosen to lead the underground. Papyrus takes over the call and says that ruling is awesome, even if he does miss his friends. (Maybe they're just on vacation).
    • If you kill Toriel, but spare Undyne and Papyrus, Papyrus will interrupt Sans's phone call to tell you that Undyne appointed him as "The Most Important Royal Position". That's literally the title. His job?
    Papyrus: Stand around and look cute.
  • After spending the whole game unable to get into Sans' room, the player is finally able to receive the key from Sans personally (which he hands to you while telling you "it's time you learned the truth...") during a Pacifist run after pulling some seriously obtuse stunts involving constantly reloading the game right after you receive judgement. Once they get inside, they're greeted to a pitch-black room with ominous sounds, and after wandering around for a while as the tension builds, Papyrus turns the light on and reveals that the player's been walking around on a treadmill in a perfectly ordinary room (well, aside from the self-sustaining trash tornado in the corner.)
    Papyrus: IS SANS PRANKING YOU ACROSS TIME AND SPACE? I HATE IT WHEN HE DOES THAT!
    Sans: *via a note attached to the treadmill* the truth is that you got owned, nerd......
    • Occasionally, you'll find the Annoying Dog sleeping in the whirlwind. Makes you wonder if Sans and the Dog are trolling partners-in-crime.
  • The true credits have a few comedic gags involving the cast's life in human society.
    • Papyrus finally gets his wish to drive a car and is enjoying cruising down the highway, then Sans pulls up beside him... on a tricycle, then proceeds to outspeed him, to Papyrus' frustration.
    • Undyne and Alphys are shown hanging out at the beach, Undyne shimmies over to Alphys and gives her a peck on the cheek, Alphys goes ten shades of red and falls over, mashing the 9 key on her phone (mimicking a critical hit), Undyne finds this so hilarious she starts tapping the ground snickering, then breaks into laughter and pounds the ground so hard the pavement cracks.
    • Mettaton puts on a show with Napstablook and Shyren, with the shapely legs from his EX form coming out of his regular body. Burgerpants is there too... but looks sorely disappointed that the "big break" he was hoping for turns out to be playing a shrub.
    • Toriel opens a school. That's not the funny part. The funny part is that Asgore is trimming a hedge out front in the shape of Papyrus's smile.
  • If you cheat your way to the end without doing anything in the game, Sans' phone call reads thusly (all the while Dogsong plays in the background):
    Sans: i'll be honest. i have no idea what happened for you to get here. this is actually some sort of error-handling message. so, if you're getting this ending...tell whoever made the game, okay? they'll fix it, or if it's a novel situation...they might even add another ending to the game. chances are though...you're just a dirty hacker, aren't you? yeah, get outta here.
  • If you take the time to walk around before heading to the surface in the True Pacifist ending, you find out that Alphys finally told Asgore and Toriel what she'd done, and how the experiments with Determination failed. Asgore gave her a big hug... And then Toriel fired her.
  • The sheer fact that Shyren's "Yellow text" within the end credits Lampshades the fact that her singing manifest as bullets during the battle with her by Leaning on the Fourth Wall.
    Released Her First Hit Single, "When You Say Goodbye It's Like Magical Bullets Are Slowly Flying Out of Your Mouth And Hitting Me"
  • The "jumpscare" after the Enemy Role Call in the Pacifist Ending. It has a shot of the mountain again, alongside a simple, heartwarming version of the main theme...and then the game fuzzes static twice and powered up Asriel appears alongside a creepy droning noise, derisively shaking his head and asking if you thought that this was really the end. He then reverts back to child Asriel, who sheepishly explains that you still have to watch the backer credits.
  • Sans' judgment of you if you're at level 14+ is surprisingly hilarious.
    Sans: hmmm... over lv14, huh. well, hmmm... judgement-wise... you're a pretty bad person. you wander around looking for people... killing them to take their money. that's just plain messed up. and what's worse, is that as bad as you are... you aren't anywhere near as bad as you could be. you pretty much suck at being evil. honestly, it's super embarrassing. but maybe you'd be better... at not killing anyone? crazy idea, huh? let me know how that goes.
  • Asriel's understatement of the century when summarizing his role throughout the game.
    Let's be honest. I did some weird stuff as a flower.

     Phone calls 
  • Calling someone in certain spots looks hilarious, even without considering what the call is about. Just imagine standing in a big puddle of garbage or in the middle of a deadly laser puzzle, only to decide to call a friend with a bored expression.
  • Calling Papyrus at the Hotland elevators makes him wonder what the L's and R's stand for. His guesses: various types of pasta. And if/once you get Undyne befriended, the elevators turn into a huge Running Gag with her and Papyrus arguing back and forth over what the L and R's mean, eventually concluding with Papyrus suggesting it stands for left and right... and then Undyne shuts him down because if you look at it from the opposite angle, they're reversed.
  • Call Papyrus and Undyne in Grillbys to hear that Undyne loves grease. Call again and her expression will turn adorable while she confesses her love to it!
  • Call Undyne next to the students in Hotland and she will mention that school is probably boring. She then offers to visit the school and beat up all the teachers.
  • Calling the two in the area with the apron will reveal that Undyne had managed to start an inferno. By cooking popsicles. It took hours to put it out, according to her.
  • If you call Undyne while next to a grass patch you hid from her in, she laments that "If it wasn't for that grass, I'd have kicked your... Uh, if not for that grooty, I'd have kicked your booty. ... Don't ask me what a grooty is!!!"
  • Calling Papyrus in the room where he delivered his daily report to Undyne, while you were hiding in some tall grass nearby, has some delightful dramatic irony.
    (First call) "WOWIE, I HAD AN AWKWARD TIME IN THIS ROOM EARLIER. GOOD HEAVENS YOU WEREN'T AROUND TO SEE IT!!"
    (Second call) "YOU REALLY DIDN'T SEE IT! I LOVE THAT FACT, AND REPEATING IT!"
  • When neither Papyrus nor Undyne are able to explain a certain steam vent puzzle, Papyrus suggests that Undyne call Alphys.
    Papyrus: AND SAY IN A HOT VOICE... ALPHYS... I NEED HELP WITH A... (AUDIBLE WINK) PUZZLE...
    Undyne: Oh my GOD! NO! Shut up!!!
    Papyrus: FINE!!! GIVE ME HER NUMBER!!! I'LL DO THE HOT VOICE!!!
    Undyne: NO!!!! THAT'S EVEN WORSE!!!
    • And if you call them back right after:
    Papyrus: (AUDIBLE WINK)... WAIT, WHOSE NUMBER IS THIS???
  • Undyne's aggressive cherishing.
    Undyne: (regarding Napstablook) Cherish this ghost!!!
    Undyne: (regarding the duck) Cherish this bird. WELL??? Are you CHERISHING??? CHERISH HARDER!!!
    Undyne: (regarding a quiet nature trail she likes) Well?! Are you enjoying nature!?
  • Undyne practices her monologues in front of the mirror (and vehemently denies this fact). Another phone call has Undyne mention she completely forgot her original pre-fight monologue and improvised.
  • Calling in the first bridge seed room nets you this gem:
    Undyne: You can't just jump across!? You can't do the jimpity jumpity joodle!? The limpity loppity leap!?
  • If you call them from the restaurant in Hotland, Papyrus and Undyne will gleefully ask you who needs to eat out when you have wonderful cooks like them for friends. The call ends with the sound of Undyne throwing spaghetti against the receiver.
  • Outside the hotel...
    Papyrus: WHAT? I? SCREAM? SURE! I'LL TRY.
    Papyrus: A. A. A. A. A.
    Papyrus: I'M SCREAMING VERY SLOWLY.
  • The call at the "WELCOME TO HOTLAND" sign ends with Papyrus saying, "N-NO! NOT THE FLATTERY SUPLEX!".
  • If you call up Papyrus and Undyne outside the lab, Undyne will suggest they all go over and watch anime. Then Papyrus starts ribbing her about how anime's for kids. The conversation is funny in and of itself, but what really seals is it when you call them back:
    Papyrus: WAIT... UNDYNE, DO YOU LIKE ANIME?
    Undyne: ...
    Papyrus: UH OH!!! I MEAN, I'VE NEVER SEEN ANY. MAYBE I ACTUALLY DO LIKE ANIME!
    Undyne: You don't have to say that, Papyrus.
    Papyrus: MAYBE I'M A BABY WHO LOVES CARTOONS FOR CHILDREN!
    Undyne: YOU DON'T HAVE TO SAY THAT, PAPYRUS!!
  • Call Papyrus while within his room. Two different outcomes depending on if you call Papyrus before the date or after:
    • Before the date with him, he'll think you're in desperate need his help navigating his house. When he realizes you're in his room, he'll ask if you heard of something called a "door". He then states he'll draw you a diagram.
    • After the date, he'll become exasperated that you have yet to leave the room and therefore, will have to start over from square one, beginning with, "DO YOU KNOW WHO PAPYRUS IS!?". Phone him again and he'll ask, "DO I KNOW WHO PAPYRUS IS?"


Don't you have anything better to—
"I already said that."

http://tvtropes.org/pmwiki/pmwiki.php/Funny/Undertale