!Moments subpages are Administrivia/SpoilersOff. Administrivia/YouHaveBeenWarned!
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[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/cat_bowser.jpg]]
[[caption-width-right:350:"[[HilariousInHindsight This looks like a job for...]] ''[[WesternAnimation/TheAdventuresOfSuperMarioBros3 Super Koopa]]''!"]]
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* A new power-up disguises your character as a Goomba, so they won't attack you. However, [[PaperThinDisguise they don't seem to notice your legs clearly exposed]]. Even worse, they could be chasing you and suddenly stop because you donned the costume, even if you got it by killing another Goomba ''right in front of them''. This speaks volumes about a typical Goomba's [[TooDumbToLive intelligence]]. When Peach or Rosalina wears the mask it's almost painful since there's either a long pink or cyan dress coming out from the head of the "Goomba", and they still suspect nothing.
** When you crouch and walk with the mask, you make the Goomba walking sounds. When you crouch-jump with the mask, you make the Goomba jumping sound. And when you wear the mask as Toad, you can masquerade as a Goomba almost flawlessly throughout the levels it's in!
** Which is even funnier if you take [[VideoGame/PaperMarioTheThousandYearDoor Goombella and Prof. Frankly]] into mind.
** Even better: when the power-up shows up in ''VideoGame/SuperMarioMaker2'', it causes all enemies to ignore you, even ''Meowser''.
* Bowser bottling the green Sprixie Princess in the opening scene.
** Not to mention Bowser ''himself'' [[LaserGuidedKarma similarly getting trapped in a bottle]] during the end credits.
** Note that, immediately after the first scene, when they jump in the pipe, Peach is the one that goes first. So, Mario, Luigi, and Toad fly through the pipeline looking up her skirt. Though the game ''does'' make a point of showing the three guys looking anywhere ''but'' up her skirt when they fly closest to the camera.
** [[FunnyBackgroundEvent Looking at Luigi during the sequence when Bowser pops out shows a few chuckle-worthy moments.]] He is the only one to be startled off his feet when Bowser first shows up, then he [[DopeSlap slaps himself in the face]] to psych himself up into following the others down the pipe.
* Some of the 8-bit Luigi cameos.
* Mario meowing like a cat is way funnier than it should be.
* Cat Mario [[MyInstinctsAreShowing trying to sneak up and pounce on a bird]] in the second trailer.
* Considering how [[TheComicallySerious reserved and dignified]] Rosalina is, just imagine her meowing like a cat, getting shrunk, and all the other hijinks in this game.
** She can be killed by ''Goombas''.
** Not to mention that if she obtains a Fire Flower, her dress turns red with white trim, causing her to look sorta like SantaClaus. This has not gone unnoticed by the fandom.
** She doesn't move her arms much when she runs, so outfits where you can see her legs, like the Boomerang Flower outfit, can come off as extremely goofy.
* How the [[MesACrowd Double Cherry]] power-up came to be: someone behind the scenes accidentally put in two Marios, and then someone liked the idea and boom!
* The final boss is a cat version of Bowser, officially named Meowser. [[Awesome/SuperMario3DWorld In practice, however...]]
* How do you defeat Prince Bully, a large silver Bully that resembles a knight's helmet who also spits fire? Why, you force him through a pipe, squeezing him into a tin can, and unceremoniously kick him around. The garbled screams he makes while going through said clear pipes make it even funnier.
** Introducing the new "Prince Bully Paper Towel Roll", available wherever "Super Mario 3D World"s are sold.
* The Star World level "The Great Goal Pole" begins with your character right in front of the titular pole. When you jump towards it, it will ''sprout wings and begin flying away from you.'' You then proceed to chase it through the level, with the goal pole repeatedly dodging to the side and making sharp corners to try and throw you off. It has to be seen to be believed.
* Start a Captain Toad level. Tap the jump button. Laugh as Toad quacks in a fruitless attempt to jump.
* The Ghost Miis that you can race against will sometimes start crawling around like cats, and what makes it funnier is that they are not shown wearing any powerups.
* Blocksteppers, who are marching soldier block enemies. When you attack one, the whole troop scatters in panic before remembering themselves and charging in unison.
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