Because there might be too many for the [[Funny/PhineasAndFerb other page]], put amusing moments here.

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* This exchange:
-->'''Phineas: ''(after finding out Perry's a secret agent) ''' "I'm sorry, I'm just having trouble processing this right now."
-->'''Perry:''' (Gives him a pamphlet)
-->'''Phineas:''' (reading) "So You Just Found Out Your Pet's A Secret Agent"-- [[MemeticMutation I DON'T WANT YOUR PAMPHLET!!!]]
** Later:
-->'''Phineas:''' Wait a minute, I just realized, you could've been cleaning your own litter box this whole time!
-->'''Perry:''' *shrugs*
-->'''Phineas:''' Oh, we are not done with this conversation!
** Later still, [[BrickJoke the brick hits]]:
-->'''Phineas''': I shouldn't have thrown away the pamphlet...
** And it hits again:
-->'''Major Monogram:''' Didn't he give you a pamphlet?
-->'''Phineas:''' I kinda threw it away...
-->'''Major Monogram:''' Does ''anyone'' read those things?!
-->'''Carl:''' I tried to warn you, sir.
* From the VillainSong, which is one long CMOF:
-->'''Doof:''' So, I just noticed that your scar goes ''over'' your eyepatch...
-->'''Doof-2:''' Yeah...?
-->'''Doof:''' ...Nothing.
** Also:
-->'''Doof:''' Coming at you Fridays!
-->'''Doof-2:''' What's that? [[ThisIsReality Are we doing a TV show together?]]
-->'''Doof:''' Oh no, it just sort of sounded like that. Y'know, we could. We should!
-->'''Doof-2:''' Hm, maybe we're ''not'' so much alike...
-->'''Doof:''' That can be your catchphrase! You're the grumpy one! Eh?
** The line "Twice the evil! Double Doofenshmirtz!" is, in itself, hysterical.
** From the two Doofs' VillainSong, complete with one holding a photo of actor Lorenzo Lamas:
-->'''Doof''': Do llamas weird you out?
-->'''Doof-2''': Are they camels or sheep?
-->'''Doof''': No, no, I meant Lorenzo.
-->'''Doof-2''': Oh, that's right!
-->'''Both''': [[NoFourthWall He played Meap!]]
** During the song there's a montage of the two Doofs as famous buddies, including [[TheBeatles John Lennon and Paul [=McCartney=]]], SherlockHolmes and Dr. Watson, LaurelAndHardy, TheLoneRanger and Tonto... and PHINEAS AND FERB!
* [[http://phineasandferb.wikia.com/wiki/File:AT2D_Still3.jpg This image]] is at least worth a chuckle, even if it doesn't make you crack up-- but it's more likely to inspire the latter reaction. (And a bonus! The image itself is spoiler-free!)
* End of the movie laughs: [[spoiler: to avoid having Perry reassigned, they use Doof's Amnesianator to wipe everyone's memories of, as Phineas calls it "the best day ever." Just before Major M pulls the switch, Isabella double checks to make sure that its as going to wipe their minds of the entire day. Cue Isabella ''planting a kiss on Phineas''. Her smug as hell expression after the fact only adds to the hilarity.]]
--->[[spoiler:'''Phineas:''' ''(over-joyed)'' Isabella!]]
--->[[spoiler:'''Isabella:''' Hit it, Carl!]]
--->[[spoiler:''(Major M pulls the switch)'']]
--->[[spoiler:'''Phineas:''' Wait, wait ''wait''--!]]
** Also serves as a [[CrowningMomentOfHeartwarming CMOH]] and [[CrowningMomentOfAwesome CMOA]].
* "Has anyone ''else'' here been leading a bizarre double life? ({{Beat}}) [[HandsGoDown Put your hand down, Ferb."]]
** The funniest part of that: Phineas knows Ferb has his hand up without even looking, implying that he already knows about Ferb's double life. Makes you wonder what kind of double life Ferb could have that Phineas not only knows about, but is completely unfazed by.
*** [[FridgeBrilliance It's the secret he told Phineas off-screen in "Spa Day."]] [[WildMassGuessing Maybe]].
* The Normbots are a veritable goldmine of these, but one in particular:
--> '''Normbot''': (whose head has just been covered with an animal skull) Get me! I'm a Georgia O'Keeffe painting!
--> '''Normbot''': I use aggression to mask my insecurities!
--> '''Normbot''': '''YOU ARE TAMPERING WITH THE...''' (Ferb pulls a wire and the less-threatening Norm head pops up) Let's make omelets!
** Special mention goes to [[RuleofThree Muffin Time]].
--> '''Doof-2''': I took over with an army of scary robots! (Lights go up, revealing an enormous army of Normbots, all with intimidating heads which retract to reveal normal Normbot heads)
--> '''Normbots''': WE SHOULD DO LUNCH SOMETIME! (Heads revert back to normal robot heads)
--> '''Doof''': Wow, that is scary!
*** Doof-2 finds out Perry, Phineas, Ferb, Doofenshmirtz and Candace are escaping from the Goozim.
---> '''Doof-2''': *SpitTake* AFTER THEM!
---> '''Normbot''': Muffin Time, Sir!
---> '''Doof-2''':(''chucks muffin at Norm's head'') '''YOU'RE BROKEN!'''
*** After the gang escape into A Brand New Reality, Doof-2 decides to invade their dimension.
--->'''Doof-2:''' ...And someone get me another muffin!
--->'''Normbot:''' But it's not Muffin Time!
* Agent P manages to distract Doof-2 for a few seconds by transmitting an image of [[FanDisservice naked Monogram]]. Major Squick ensues.
** Monogram's in the shower, and the chain-reaction - Doof-1 covers his eyes, then Doof-2, then Platyborg, then the Normbots - is icing on the cake. Apparently a bubble-clad Monogram is BrainBleach material.
** "I ''told'' you! ''Not between 3:30 and 4:00!''"
* Doof-2's reason for being even more evil than our Doof: [[spoiler:''he lost his toy train as a child''.]] Even ''[[HarmlessVillain our Doof]]'' can't follow the logic.
** Doof-2 was himself surprised that our Doof didn't become as evil as he is due to his many {{Freudian Excuse}}s.
* Granted, this moment being in the middle of a fairly serious situation kind of diminishes it, but Doofenshmirtz realizing that Perry deliberately peed on his couch has ''got'' to count. Especially considering Perry's face at the accusation.
* And of course, Doofenshmirtz's complete inability to recognize Agent P without his hat. Doof-2 had already spent a couple minutes [[DangerouslyGenreSavvy trying to point this out to him]], and eventually decides to have Platyborg attack Phineas and Ferb to force Perry to prove it. When Perry breaks cover to fend him off, we get this:
-->'''Doof-1''': Wait a minute, I'm confused. Why does their platypus fight so good?
-->*Perry rolls his eyes and finally puts on his hat*
-->'''Doof-1''': [[SayMyName PERRY THE PLATYPUS!!!]]
-->'''Doof-2''': ...[[YouHaveGOTToBeKiddingMe Really?]]
-->'''Doof-1''': ...[[ComicallyMissingThePoint What?]]
-->'''Doof-2''': (FacePalm)
** Followed soon after by Doof-2's presentation of Perry's ClarkKenting.
-->'''Doof-2''': You know, I'm starting to see why you haven't become ruler in your dimension".
* "I'm [[spoiler:Jeremy Johnson]] [[StarWars and I'm here to rescue you!]]"
* During the final battle Baljeet wears The Beak armor only to lose the bottom half, leading to one of the funniest moments in the entire series in this troper's opinion:
-->'''Baljeet''': Has anyone seen my pants?
-->'''Buford''': They're over there. (points)
-->(Cut over to Irving with a pair of crowbars and "The Beak" pants, going up and down in the pants over a pile of dead robots.)
-->'''Irving''': [[Film/RedDawn1984 WOLVERINES!]]
** It's even funnier when you notice that Irving's essentially [[http://www.giantbomb.com/tea-bagging/92-142/ Teabagging.]]
* "This might not be the best time to tell you this but I actually flunked jungle gym in grade school."
* Baljeet in The Beak suit sissy-fighting Norm-Bots... and knocking them out of the sky.
* Doof-2 asking Phineas how to open the portal: Phineas says no for obvious reasons... so Doof-2 tries a dog-sock puppet and gets the exact same results.
** Just the way that Phineas refuses every single time is both hilarious and a CrowningMomentOfHeartwarming.
*** And later after [[spoiler:Doof-2 dooms regular Doofenshmirtz with the rest of the cast... using the puppet.]]
-->[[spoiler:'''Doofenshmirtz:''' [[CallBack If I had a nickel for every time]] I've been doomed by a puppet, I'd have... two nickels. Which isn't a lot, but it's weird it happened twice, right?]]
* Most of Ferb's lines bounce between this and CrowningMomentOfHeartwarming. For example:
--> '''Phineas''': [[TearJerker I thought you couldn't spell 'platypus' without 'us'.]]
--> '''Ferb''': ({{Beat}}) [[MoodWhiplash Well you could,]] [[CompletelyMissingThePoint but it would be "platyp".]]
* There's something inherently funny about one of the gizmos being used in battle at the end being ''the continent-painter from the theme song.''
** How about the frozen yogurt machine? It's clearly visible during sections of Robot Riot... [[ImprobableWeaponUser taking out Normbots by throwing globs of frozen yogurt at them.]]
** The platyposterior as well. Not so good for its intended function, hatching eggs, (at least according to Candace) but great for slapping the crap out of Normbots.
* Buford-2 is so good at resisting that he [[spoiler: started resisting the Resistance.]]
--> [[spoiler: '''Candace-2''']]: Buford - keep resisting!
--> '''Buford-2:''' No!
-->[[spoiler: '''Candace-2''']]: Excellent!
* Just the very fact that the Resistance consists of the Fireside Girls is a hilarious twist. Made even better by their simultaneously girly and badass hideout and Isabella's threatening "Whatcha doin'?"
* What about when Doof-1 asked Candace to unlock his chain while they were dangling over lava?
-->'''Candace''': Are you even paying attention?!
-->'''Doof-1''': ''(realizes where he is)'' Oh, right. It can wait.
* "What? I never built an Amnesia-inator! [[HypocriticalHumour I think I'd remember building something like ''that'']]."
* Doof-1 explaining that his attempt at a robot invasion never worked because he [[TooDumbToLive put self-destruct buttons on]] ''[[TooDumbToLive the bottom of their feet.]]''
---> '''Doof''': Aaaand march! '''*BOOM!*'''
** Also his realization that the self destruct button on the portal generator is unnecessary, and the fact that he later lapses and includes one when he rebuilds the portal generator.
* Existentialist Trading Cards, for all you philosophers out there.
--->''"I'll trade you two Satres for a Nietzsche!"''
** And Baljeet's reaction when the trade was complete, [[GeniusBonus Genius Bonus]] or not:
--->''"Sucker!"''
* Phineas and Ferb using Doof as a bridge between planets in a different dimension, followed by a comet(?) burning him.
** ''On his butt,'' no less.
* You can always get a good laugh out of a grown man wearing an eyepatch and an evil black labcoat hugging a toy train.
* Perry entering Dr D's place: he bursts in, all action as usual...then sees the boys. Cue slow-motion fall to the ground and OhCrap face.
* Some of the dimensions that they pass through on the long way home feature funny shout outs to recurring characters including the Psychedelic Zebra that always calls Candace Kevin (they even seem to recognize each other), the giant green alien from "She's The Mayor", a Q*Bert dimension, and a dimension full of Giant Floating Baby Heads.
** Even better, when Candace sees the Zebra, she quickly pretends she doesn't know him while he grins. And the newspaper the Zebra's reading reads '[[ContinuityNod Kevin Wins Election']]
*** And the newspaper's image is a silhouette of Candace behind a podium.
* '''VICTORY GUM!'''
** Made hilarious by the note on the packet 'Even if you win by forfeit'.
* Some of the very random explanations for the gadgets Perry's given.
-->'''Carl''': [[CripplingOverSpecialisation Of course, you'll only need this if you're attacked by a royal or a member of parliament...]]
* Stacy's opinion on the importance of evidence;
-->'''Stacy''': I am a woman of science. At least, that's what my horoscope said.
** And speaking of Stacy...
--->'''Candace''': Now, does anyone need to go potty first?
--->[[{{Beat}} *Beat*]]
--->*Stacy raises her hand*
--->'''Candace''': Fine, make it quick.
* The fact that the transportation in the Doofenverse seems to involve harnesses and giant hooks on buses.
** YMMV. I found that to be dangerous, not just as a run-over danger, but also as a danger of breaking your neck. [[FridgeHorror Imagine doing that for your entire working life...]]
* Blink and you'll miss it-at at the end of the movie when everyone is getting their minds wiped, Doofenshmirtz is included in the bunch. But he's wearing a strait-jacket, and he's not happy about it.
** Better in that it is a ShoutOut to SilenceOfTheLambs.
* Platyborg getting a roast chicken stuck to the back of his stinger tail [[spoiler: and then his head]], and Perry's [[NotSoStoic reaction.]]
* May or may not be intentional, but in the online game "Robot Riot," Phineas' reaction upon finding out that Perry is a secret agent is ''completely opposite'' of his reaction in the movie, presumably to simplify the plot.
--> '''Game!Phineas''': "Perry is a secret agent? Cool!"
* Stacy talking to the "mysterious force," making a shrine for it, asking it to bring Candace back...and then when Candace does reappear, Stacy follows-up by asking for a car, too.
* "[[CrowningMomentOfAwesome We figured out a way to bypass the entire security grid!]] It was cool."
* "A unicorn Stacy, a unicorn! ''(in childlike voice)'' Hi, I'm six!". Because it was quite a TakeThat against the non-periphery demographic and she was so cute when she did it.
* "Perry, no! We do not bite the elderly!"
** "Again, ''ow''..."
* Naturally, the deleted scenes contain all sorts of gold, but the one that stood out the most was this:
--> '''News Anchor''': Good morning, Danville! Here's our top story...Well, what appeared to some to be a giant invasion of killer robots from another dimension actually turned out to be...a weather balloon! And now, here's Kip Morris with the weather.
--> '''Normbot''': *Holding a report* '''RAIN WILL FALL!'''
** Made even funnier considering it might be a Shout-Out to [[FamilyGuy Ollie the Weatherman.]]
* This exchange right after Robot Riot:
--> '''Stacy''': Where are you going?
--> '''Candace''': I'm going to bust my brothers to my mom! ''[[GenreSavvy And I'm gonna fail!]]''
* The movie tie-in magazine includes a comic on how Doof-2 turned his Perry into the Platyborg, as well as the AmusingInjuries that occured while trying to program him, the first of which being [[spoiler: the scar over Doof-2's eyepatch. ''("Now I look like a fool!" "I think it looks trendy!" "Quiet, Normbot!")'']] After several weeks of this, Doof-2 finally succeeds in getting Perry-2 to obey his commands without causing hilarious accidents. He sends Perry-2 and his robot army out to conquer the Tri-State Area, expecting all to know his name. The newspaper headline next day reads [[spoiler: "Platypus conquers Tri-State Area"]]
-->'''Doof-2:''' You have got to be kidding me! Curse you, Perry the Platyborg.
* "Everything's Better With Perry" has hilarious lyrics of the MundaneMadeAwesome variety. It's also quite amusing the way Phineas and Ferb have their whole room programmed to interact with Perry as they start their day. And then there's ''Ferb singing backup''.
** In the same vein, "Summer (Where do we begin?)" features a clip where Ferb is holding a hose and accidentally sprays Phineas with it as the latter approaches. So he holds the hose up and sprays himself in the face, too. [[SarcasmMode Infallible logic.]]
* This bit:
-->'''Phineas-2:''' Mom says that talking to neighbors is dangerous
-->'''Linda-2:''' (from the basement) It's true!
* More funny dialog:
--> '''Candace''': You guys are so...Wait, why are there four of you? Are we inside the mysterious force? And why is Isabella suddenly fashionable?
-->'''Isabella-2:''' What do you mean, 'suddenly'?
** "Seriously, how do I dress in your dimension?"
* The ridiculous alarm clock, which wakes Perry so he'll chortle and wake Phineas.
* Doof's interaction with [[EverybodyLovesRaymond Marie Bar...]] err... [[HeyItsThatVoice Mrs. Thompson]].
--> '''Mrs. Thompson:''' Who is this?
--> '''Doofenshmirtz:''' I'm Heinz Doofenshmirtz. Your neighbor? For like twelve years...
--> '''Mrs. Thompson:''' Who?
--> '''Doofenshmirtz:''' I live in the penthouse. I wear...labcoats a lot. [[CaptainObvious I speak with the accent I am currently speaking to you with.]]
--> '''Mrs. Thompson:''' Oh, just like my neighbor upstairs.
--> '''Doofenshmirtz:''' ''(excitedly)'' Yes exactly!
--> '''Mrs. Thompson:''' I'm sorry, he's not home right now, you'll have to come back later.
* For a hilarious FreezeFrameBonus, on the very brief scene near the end that shows the OWCA building from outside, there is a sign that says: '''OWCA Headquarters''' and in smaller print: '''(Pay no attention to this sign)'''.
* ''All'' of Doof-2's lines in the accompanying online game are hilarious, as are Baljeet-2 being a DeadpanSnarker and Ferb's reaction to Doof-2's plan to trap the protagonists in a maze filled with Normbots ("Is that the best you could come up with?").
* The Norm-Bot with the skull on it's head:
-->"Get me, I'm a Georgia O' Keefe painting."
* In the other dimension, after [[spoiler:Platyborg]] and Perry fight [[spoiler:Platyborg]] Falls of the roof the two were fighting on...and onto a bus. After Phineas, Ferb, and Perry escape, A cab drives up to the building...[[spoiler: with Platyborg on the wind shield, crashed,he disembarks, and pays the driver, who asks for a tip, Platyborg then threatens him with a mace.]]
** Also Phineas, Ferb, and Perry's reactions to the Platyborg barely missing being hit by a falling norm bot only to get hit a bus.
* During ''Summer (Where Do We Begin)'', the boys get carried away and start [[spoiler: singing a verse of the show's theme song]]...but realize quickly they're going too fast for their second dimension counterparts.
* The way the second-dimension Doof-themed trains arrive at their destination.
-->'''Recording of Doof-2's voice''': Nyeeeehhhhhhhrrrrrrrr GET OFF!
* In the [[LicensedGame DS tie-in game]] (the only version I've played so I'm unsure if it's the same in the other versions), Phineas, Ferb, Perry, Candace, and Doof are travelling through dimensions and they hit a haunted-castle-themed world.
-->'''Doofenshmirtz''': Monsters?! Hold my hand, Perry the Platypus!
-->'''Candace''': ...Okay, now that's just ridiculous...
** To make things better, once you finish the world you can see that Perry is indeed holding Doof's hand. Almost doubles as a CrowningMomentOfHeartwarming when you realise that Perry held Doof's hand, comforting him for the entire journey through the spooky dimension.