Funny / One-Punch Man

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     In General 
  • There's loads of awesome and heartwarming that happens when Genos keeps studying and learning from Saitama like a glimpse of his true power or Saitama's heroic actions despite only a few people witnessing or recognizing them. It becomes hilarious, though, when it's shown just how thorough he is about everything there is to learn, such as the angle of Saitama's reclined position while reading a book. As if that's a factor in his powers.... OR IS IT!?
  • Any time Saitama casually defeats the Monster of the Week and treats it like it was no big deal, especially when in his non-serious look face. Made more hilarious if said villain defeated other heroes prior to Saitama showing up.

Introduction Saga

     Saitama Introduction Arc 
  • In the first episode, the giant "strongest man in the world" fight. Saitama jumps onto his shoulder, and the giant's brother on his other shoulder commands him to "squash the guy on your shoulder". The giant crushes his brother. His reaction at realizing he just killed his brother is priceless.
    Giant: [beat] NIIIIII-SAAAAAN!!! / (Dub) BROTHER, NOOOOOOOO!!!!
    • The first episode's dub also has a priceless one-off line, temporarily interrupting Saitama's monologue with Crablante:
    CRAB MONSTER!
    • Crablante's motivation for sparing Saitama: "Your eyes are cold and lifeless. Since we have that in common, I'll let you go this time!"
  • The first episode of the anime shows us how overpowered Saitama is. Then the second episode shows us that even his godlike power has limits as he faces his greatest opponent yet: a mere mosquito.
    • On that note, there's the opening lines on the current mosquito problem:
    Mosquito "Expert": Obviously they're a new species, so I obviously can't tell you anything about them.
    Reporter (pissed off): Seriously? What the hell man? Then get off my show!

     House of Evolution Arc 
  • Genos' backstory.
    • Made funnier in the anime at how Saitama is noticeably fidgeting and Genos keeps talking faster and faster with the background music.
  • The House of Evolution scientists are watching a recording of Mosquito Girl's failure when the obvious question comes up upon witnessing the circumstances of her defeat.
  • When the House of Evolution begins their attack, a praying mantis monster crashes through the ceiling. Before he can say his name, Saitama does his thing.
  • After seeing the lion get turned into a messy pulp by Saitama, the mole rightly runs like Hell. However...
    Saitama: found you
  • Genos' afro.
    • The anime even gives it a continuity nod in the next episode when Genos is being repaired: his hair is back to normal, but his afro is visible in the background.
  • Asura Rhino smashes Genos into the wall. Saitama's response is delivered completely seriously.
    Saitama: You turned Genos into a piece of modern art.
  • Saitama vs. Asura Rhino. Asura Rhino activates his berserker form and says it will last an entire week. At first, Saitama sounds worried about stopping him, but he works out what next week is and realizes that today was the special sale he was looking forward to and punches Asura Rhino's entire head off.
    Saitama: That means today is... Is... BARGAIN DAY AT THE SUPERMARKEEEEEEEET!!!!!
    • In the anime, Genos' reaction makes it even funnier, running up to Saitama to tell him that they have 4 hours left to be there and they can still make it in time, with a serious and excited tone, like it was a matter of life or death.

     Paradise Group Arc 

Hero Association Saga

     National Superhero Registry Arc 
  • The Hero Association Physical Test Examinations.
    Everyone sees Saitama's capabilities
    Random Hero Wannabe: I'm going home.
  • After passing the hero exam, Saitama meets teacher Sneck, who, as you might expect, is a very Smug Snake. After hearing that Saitama and Genos are MUCH stronger than him, he goes off to disprove this by attacking Saitama while the latter is walking about, deep in contemplation. We see him throw one punch about to land... and the next frame is him buried headfirst in the ground, with Saitama carrying on as if nothing happened.
  • During Saitama and Genos' training match, it looks like Saitama is actually going to get serious and completely rock Genos' face off... only to end his punch about an inch away and then flicking Genos in the forehead. He then does the goofiest little march away after declaring that they're going out for some udon while the panel cuts to show that the blowback from Saitama's punch decimated the entire mountain range behind Genos.
  • Later, in the anime version, Saitama and Genos both engage in a Super Spicy Mega Monster Udon Challenge while they're having dinner. Saitama loses to Genos.
  • Genos declaring he wants to room with Saitama. "Hell no." "I can pay you rent." "Did you pack your toothbrush?"
  • Saitama discovers that C-class heroes get kicked out of the association if they're inactive for a week, after five days of slacking off. He spends the next two days running around the city only to find that it's finally peaceful for once. Tank Top Tiger then appears and tries to take him in, as Saitama running around is making people suspicious. Sonic shows up next and starts wreaking havoc in order to get Saitama to fight him, but Saitama initially refuses because he needs to find a bad guy. Then the penny drops:
    Sonic running around and destroying the surrounding area
    Saitama: Oh.
    Saitama pops up behind Sonic
    Saitama: Here's a bad guy.
    Sonic and the injured get carried off in ambulances. The last panel shows that the pavement has an imprint of Sonic's smiling face on it.

     Rumored Monster Arc 
  • When Genos sees that Saitama brought home a large amount of kombu, he tells Saitama that kombu doesn't help in making hair grow, thinking that he bought this much for this purpose. Saitama was not amused with Geno's comment.
  • Saitama's doing a Spit Take when Genos reveals that he ranked #6 on the public popularity poll. Genos even reads the positive comments about himself with a straight face but brushes it off saying that the public only based their impression of him from his photo, leaving Saitama annoyed.
  • Fubuki doing the next episode preview despite doing an Early-Bird Cameo. Eyelashes regretfully reminds her that she and the Blizzard Group won't appear in Episode 7 despite her hopes.

     Giant Meteor Arc 
  • "Don't you dare touch this city....I LIVE IN IT!"
  • With Genos giving it his all to push the meteor back moments before its estimated impact, as Bang watches he tells him he sees the meteor slowing down.
    Genos: Really?
    Bang: Oh, no. It was just my imagination.
    Genos: You senile bastard!
    • The fact that Genos just cursed on his much older S Class senior makes it hilarious, although it's justified considering the condition they are in.
  • Saitama's lackadaisical demeanour as debris from the meteor engulfs the city in chaos. [1]

     Sea Monster Arc 
  • The vocal rendition of Lightning Max's "ASDFGHJKL" reaction to the Sea King inexplicably sneaking up on him is glorious.
  • When Sonic and Pri-Pri-Prisoner meet, Pri-Pri-Prisoner tells him why he was keeping himself in prison. Sonic remarks that he should stay in jail. Also when Pri goes "Angel Style" and declares that no one has seen him in that form and lived, Sonic thinks that he'd better go home.
    Sonic: He's naked. And he's definitely no angel. Nor is he human. Nor do I want to watch it. I'm out.
  • The Sea King's handling of Licenseless Rider in the anime. After blocking his first punch with an open palm, he performs what could best be described as a half-assed version of Metronomic Man Mashing, lazily swinging him by his arm against the ground six times before accidentally tearing his sleeve off and flinging him into the air. From how he's stood, he might as well have been trying to shake his hand.
  • Also from the anime: The Sea King punches Saitama in the head, which does nothing but cause said head to waggle like a bobblehead.

     Alien Conquerors Arc 
  • Tatsumaki's anime-only segment in episode 10 can be considered this. A giant Godzilla-like monster starts attacking a mountain range and Tatsumaki gets airlifted in to fight him. Just as she lands, however, she gets a phone call from the Hero Association calling her back, and she starts arguing with them, completely ignoring the monster. He starts speaking over her on the phone, and she gets angry and insults him and his chin before killing him. Also doubles as a Crowning Moment of Awesome.
  • Speaking of Tatsumaki in ep 10, there's also her Art Shifts to ONE's webcomic style. Turns out seeing them animated is just what's needed to make them utterly hilarious.
  • During the meeting of all of the S-classes, the scene shifts to a sequence showcasing all of the S-classes in the order of their rank and their thoughts on the meeting... until it gets to Saitama, who, despite being only a B-class and not actually having been invited to the meeting, asks for some tea. The next chapter then starts off showing that yes, Saitama was given his tea.
    • Saitama asking for tea becomes funny later on as the S-Classes remember Saitama as "that B-Class who drank tea during the meeting".
    • A lot of the S-classes themselves are funny too, especially considering that this is the first time the readers see them. They've been set up as being the greatest and strongest of all of the heroes in the entire organization, but many of them are taking the meeting just as seriously as Saitama.
    • Metal Bat and Tatsumaki get into a childish argument that threatens to turn into a fight. Flash then asks the fight to stop by suggesting that Tatsumaki was going to kill Metal Bat if the fight was left to continue. Metal Bat is not amused and calls him "hairpin" in anger.
  • During his fight with Boros, Saitama punches Boros across the city-sized spaceship they were on as soon as the alien stops talking. Boros survived a full on, serious attack from Saitama, but at the cost of his armor. The clincher? The armor acted as a Power Limiter.
    Boros: I've lost the armor that kept my immense powers under control.
    Saitama: (in a less detailed, cartoonish panel.) Okay.
  • Tank Top Master decides that he doesn't want to be left out of the fighting, so he grabs the nearest chunk of rubble and chucks it at the ship. Tatsumaki then shows him up by grabbing dozens of pieces bigger than his (one of which he's standing on) and throwing them all at once.
    Tank Top Master: I give up!
  • After the invasion is over, Tatsumaki starts chewing out Saitama for rushing ahead into the spaceship and not respecting his lowly station as a B-Ranked hero, but most importantly calling him a "baldy" over and over again. Saitama then instructs Genos to tell her off. Genos tells her to shut up or he'll crush her. Cue Genos getting smashed into a giant pile of rubble.
  • The ending of episode 12 is this after the credits, showing a scene involving Saitama and Genos where Genos saves a child from a giant demon pig using a borrowed catchphrase to introduce himself and Saitama, who announces himself with a One-Hit Kill that reduces the monster to Ludicrous Gibs just like the opening of the first episode. Saitama's reaction is priceless.

     King Arc 
  • King doing a Double Take when he discovers Saitama inside his apartment.
    Saitama: Your window was open.
    King: This is the 22nd floor.

Human Monster Saga

     Garou Introduction Arc 

     The Blizzard Group Arc 
  • Blizzard, Eyelashes and Mountain Ape trying to intimidate Saitama is undercut by how obvious it is that he could not give less of a shit.
    • When Fubuki first introduces herself, she asks if Saitama knows who the Blizzard Group is. After a brief moment of thinking. he responds with the goofiest smile on his face saying he has absolutely no idea who they are. When she explains she's the 1st Rank Hero in B Class he congratulates her and simply asks "So?" with the same goofy ass smile on his face!
      Eyelashes: B-class rank 7, Saitama! We know you live here! Come out! The B-class rank 1, Miss Blizzard of Hell, would like to speak with you!
      Saitama: Hm? Oh, if it's about newspapers, I already have one.
      Eyelashes: We ain't selling anything! We're heroes with higher ranks than you!
      Fubuki: Nice to meet you, freshman. I am Blizzard of Hell... You know what that means, right?
      Saitama: Uh, nope. Who're you?
      (Beat)
      Eyelashes: She is the B-class hero ranked 1st!
      Saitama: Oh, okay, good job. So?
      Eyelashes: (thinking) Argh... This guy's got some balls...
  • We get the first look at the Mundane Made Awesome effect Saitama's "Serious Series" can have on basic moves with "Serious Consecutive Side-Hops".

     Hero Hunt Arc 
  • Saitama and Garou's first meeting. Both dine-and-dashed out of the restaurant they ate in. Garou doing it first deliberately and Saitama chased him in order to escape the place after he realized he forgot his wallet at home. Saitama didn't recognize the villain and knocks Garou out while thinking he's sorry for doing it.

     Monster Raid Arc 
  • In Chapter 47, Saitama meeting Tanktop Master in the hospital when he joins in on Saitama and License-less Rider's conversation.
    Saitama: That guy... He just barged into our conversation, you know him?
    License-less Rider: He's the S-Class hero, Tanktop Master.
    Saitama: Ah yes, I heard it on the news! The guy who got his ass kicked the hardest.
    Tanktop Master: At least mention that I didn't go down without a fight!
  • Saitama deciding to enter a martial arts competition by disguising himself as Charanko. Also Genos' reaction to seeing Saitama wearing a wig, which was to call Dr. Stench and try to get him to fix Saitama's baldness.
    • When buying the wig, Saitama runs into Garou, who believes Saitama is trying to make a name for himself by defeating him, and attacks. His blow doesn't even faze Saitama despite driving him up to the ankles in the pavement, and he responds with a single blow that knocks Garou out. And the kicker? Saitama didn't know who Garou was, and was simply trying to talk to him while out shopping. And when Garou hit him, Saitama asks "Are you mugging me"?
  • The tournament announcer introducing Saitama who's disguised as Charanko:
    Announcer: He was reading manga in the waiting room and sent a note "Please do not hit me on the head"! Does he even know what this is about?! But anyone can enter as long as you have a ticket! This is Super Fight! "Water Polo Carbonated Fist" Charanko!
    (The audience boos Saitama)
    Saitama: Why is the booing already starting?
    • In the crowd, Genos is seen clapping loudly for Saitama with a stoic look on his face.

     Monster Association Arc 
  • When a group of S Class and high ranking A Class heroes begins raiding the Monster Association, there's a chapter basically dedicated to showcasing the abilities of those who haven't had much time in the spotlight so far, where they go up against members of the organisation with similar powers or attributes and completely wreck them. The funniest of these has to be "The Great Food Tub", a monster who makes his debut bragging how he's going to swallow all the heroes whole, only to be immediately eaten whole himself by Pig God.
  • Before the raid, we are shown to what the missing S-Class are doing. They're hanging out in Saitama's apartment. Saitama cooks hotpot and sets it on the table, which the guests promptly fight for. Genos and Fubuki fight over meat while King is knocked unconcious by the scuffle. Saitama threatens to kick them all out, which creates another fight with Fubuki and Genos.
  • Bang's fight with Fuhrer ugly. Bang has the upper hand, successfully creating holes in the other's body. Then Homeless Emperor shoots out his energy balls to his direction. Bang unsuccessfully calls time out and gets caught in the explosion
    Genos: Should we keep watching?
    Bomb: I'm sorry. I didn't think it would turn out that way.
  • When Garou asks Saitama why he's a hero, there's a build-up of 4 full-page images of Saitama picking his nose before he just says "It's a hobby".
    • Followed by a literally faceless Garou drawn in the corner the next page. You could say he didn't see that coming.
  • The reason why Saitama is late: He was buried with Lightspeed Flash when Tatsumaki pulled the MA headquarters to the surface. Lightspeed Flash says that something will break and our hero thought it was his arm that was pinned under the rocks, so he had to manually move the rocks in order to remove it. But what Lightspeed Flash is refering to is his sword, which promptly breaks after Saitama accidentally breaks it after pulling it out in frustruation.
    • What makes it even funnier is how it happened. Saitama punched Flash's head, which hits the back of the sword and it breaks in two. Flash's expression sells it even more.

     Psychic Sisters Arc 
  • Saitama and Tatsumaki pushing each other's Berserk Button.
    Tatsumaki: That was dangerous! Look where you're deflecting things! Baldy!
    Saitama: Ba- (Beat) The fuck you call me, midget?!
    • Even better when you consider "Baldy" is actually a part of his hero name.
  • Chapter 104 is one long CMOF with Saitama and Tatsumaki.
    • They interrupt and resolve a dramatic confrontation between a nearly dead A-Class hero and the gang that deceived him just as tensions rise to their peak.
    Feather: I'm a hero and this is my climax!
    Saitama and Tatsumaki crash through the wall behind him
    Feather: NGOBH
    • Metal Bat is called to H City to take care of a rampaging monster, even though he would rather be at home taking care of his birthing cat, and plans to vent his anger on the beast. After a long trip delayed by backed up traffic, he arrives just in time to see the two one-shot the monster with their bickering.
    • When Saitama and Tatsumaki's fight takes them far away from their previous location, Saitama manages to get Tatsumaki to temporarily stop fighting until they get back to the Hero Association. When he asks her for directions, she gladly shows him the way by dragging his face through the ground.
    Saitama: Hey! Isn't this bad for my scalp?!
    Tatsumaki: Shut up!
    • Sonic spots the two and makes another attempt on Saitama's life, only for that attempt to fly back towards him. His speed and honed reflexes would get him out of this situation...except a dog did its business at the worst possible time and place. *slip*
    Sonic: CURSE YOU SAITA- *explosion*

Others

     Bonus Chapters 
  • One of the bonus chapters features the first, and so far only, enemy to put a visible injury on Saitama: Torako, a housecat.
  • Saitama kills a car like it's nothing. Passersby, on the other hand...
  • The Volume 9 omake about the Blizzard Group pooling to get a car has a lot:
    • At the outset, we see the group heading for an impressive big black car... only for them to drive off in the tiny little rental hidden behind it.
    • After a week the group has pooled funds through part-time jobs. And then Fubuki walks in having snagged 2 million yen by herself. This leads to the group thinking she was getting it through...illicit methods. Turns out she was out bounty hunting, which was what she actually meant when talking about using flyers to get money quickly.
    • And then the car is pointless because they get stuck in traffic going after a target. A target which is powderized by Saitama who was going on foot.
    • There's even a frame where you see Saitama run past their car.
  • Fubuki trying to get Saitama to join her in a fairer fashion by having him and his pals (Genos, Bang, and King) play her group at fighting games. Bang lost because he never played a video game before, Genos lost because he doesn't know how to properly hold a controller without crushing it and thinking that pressing the buttons harder will make his character hit harder, and Saitama lost before he even started playing. But when King steps up to play, her guys get WALLOPED.
    • Then she has to treat Saitama and his pals to dinner. Which she delays by being finicky over counting calories.
  • Darkness Blade, during a costume contest, shows off the dangers of his Impossibly Cool Clothes: simply lifting his arm too high (in this case to wave at the audience) lodges his shoulder spikes into his head, causing some rather profuse bleeding.

    OVA 
The Shadow That Snuck Up Too Close
  • The OVA starts with Saitama watching a movie titled "Alien Vs Stalker".note  His comments after finishing it: "Man, stalkers are really scary..."
  • The fact that Genos has been stalking Saitama the entire time after the Mosquito Girl fight to research his strength before deciding to confront him.
  • Saitama going to a restaurant and ordering a plate of French fries because that's the only thing he can afford. When Saitama gets his fries, he complains that the portion is small, only one fry is long and soft and the rest is short and crispy.
    • Genos follows Saitama inside the restaurant and he seats behind Saitama. He uses a mug to cover his face to ensure Saitama doesn't see him.
    • After Saitama leaves to use the restroom, Genos takes the long fry to determine if the food he eats is the source of his strength. When Saitama returns and sees that the long fry is gone, he asks the waitress if she ate his fry.
  • When Saitama realizes that he's being stalked, he hides outside his apartment for two hours to see if his stalker appears, unaware that it's Genos. In the distance, Genos observes Saitama hiding for two hours and wonders if he's doing some kind of exercise.
  • When Saitama encounters a B-Class criminal known as Men's Esthetician Man, despite the criminal remembering Saitama for beating him, Saitama doesn't remember him. When the criminal mentions that he's been trying to find him, Saitama jumps to the conclusion that he's the stalker who stole his French fry and turns his face serious before one punching him into a wall. The criminal has a Oh Crap! reaction before it cuts to black.
    Saitama: I don't care how many times you come back to challenge me. But let me just say this... Don't you ever go around stealing people's French fries again! If you're gonna come at me, come at me straight.
  • The credits have chibi versions of the cast. Saitama is dancing, Genos is playing the drums, Tatsumaki flies across the background, and Sonic is air-guitaring while Licenseless Rider gives a thumbs-up in the background.

The Pupil Who Is an Extremely Poor Talker
  • Don Pacino pretty much lampshades that Genos has No Social Skills complete with Title Drop upon hearing him give a long story about Saitama's keys.
    • He reprimands Genos for actually getting into detail in a conversation between him and Saitama where the two of them were discussing how to sing the Fa syllable. When Pacino complains about pronouncing the syllable, Genos proceeds to show him how to pronounce the syllable.
  • Genos is very passionate about singing the ending song. I suppose he does have perfect pitch, after all...

The Ninja Who Is Too Complicated
  • The beginning of the OVA has Sonic fighting a monster that looks like the Sea King and the battle about to end with a Groin Attack that causes the scene to shift and reveal that it was a nightmare...that Sonic had of Saitama. Considering how different Saitama looks from the nightmare Sonic fought, it's funny that he traumatized him despite his lack of effort in trying to fight him.
  • Sonic gets a pet baby boar during his training. His name for the boar fits it just as his own name fits him.
  • Saitama somehow being The Dreaded to a bear just as he is about to kill it while having the goofiest face ever.
    • Also the fact that Ino was more afraid of Saitama than the bear.
  • Sonic's version of the ending in the last lyrics has his voice drop in pitch as a Call Back of the accidental Groin Attack he suffered from Saitama.

The Overbearing Bang
  • It's Bang's turn to be the stalker, which is every bit as hilarious as it sounds.
  • Bang keeps trying to get Saitama and Genos to come to his dojo, eventually resorting to bribing them with food.
  • Extreme Rock-Paper-Scissors, with a metal bowl and a tiny hammer to whack the loser. Saitama gets into such a losing streak that when he finally wins one, he craters the floor and Bang barely dodges.

The Murder Case That Was Too Impossible
  • No one really cares too much about how Zombieman got stabbed since he's immortal anyway, so he just sort of shrugs it off.
  • Who stabbed Zombieman? Tatsumaki, after getting super drunk to spite Saitama. Her childish, drunk-off-her-ass face as the security footage shows her brutalizing Zombieman is oddly funny, partly due to how we know he won't be affected by it.

     Unsorted 
  • In the anime's opening, Saitama is seen One Punching a bunch of monsters in quick succession that are all ugly, monstrous and/or huge. But a couple frames show him destroying a cute (albeit knife-wielding) star-shaped creature, which was even smiling before getting shattered into dust by Saitama's fist.
    • Also, the moment where a lightning bolt strikes Saitama's bald head. He doesn't even react.
    • Despite how hot-blooded it is, his theme song is funny - it's essentially him complaining that he's super strong yet it's boring and he's unpopular!

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