Whenever Peach hits someone in the head with her frying pan. Bonus points if it's Bowser, Mario, or someone more serious like Meta Knight. Just imagine the characters' reaction if they spoke.
Starting in Melee, when a character gets knocked off-screen upwards in regular fights, there's a rare chance where instead of getting Star-KO'd, they end up getting launched into the screen. The fourth game makes this even funnier by having the character get stuck to the screen before sliding down. The look on their faces when this happens is priceless.
Whether you're fighting against other players or computers, any given battle in this series can be hilarious. This is usually the case when items are involved, as they add an element of randomness. Items or not, the ridiculous ways people get KO'd will usually make them laugh, often taking their loss in stride. Some players have made montages of these moments and uploaded them online, such as this one. Even awesome moments like this can make people laugh, because of how over-the-top they are.
A blink-and-you'll-miss-it part during the intro, which has Pikachu rolling atop a Pokéball.
The Peach Bomber attack in it's entirety. Peach throws her self at the opponent, rump-first, and if she hits it creates a fiery explosion of all things? What is in those cakes of hers? Brawl toned down the hilarity by making the explosion into a heart graphic.
Luigi's introduction in Adventure Mode. The cutscene starts as normal, with Mario jumping into the air, ready to battle the player... only to be knocked backwards by Luigi footstooling him in mid-jump.
A sufficiently-weakened Mewtwo changes his method of climbing up ledges. He walks up. Even as a casual display of his power, it's an odd move for someone as no-nonsense as he usually is.
The fact that there are two extremely tiny CPU-controlled characters in the Kaiju-based event match Gargatuans. While they are obviously just there to represent civilians who are caught within the crossfire of the epic battle, it is possible to be able to win the match without even doing anything because of DK trying to get these two characters.
Snake: The cornered rat will bite the cat... sounds like trouble. Mei Ling: Hey! When did you become so good at proverbs? Snake: You must have rubbed off on me. Mei Ling: Well, come back in one piece, and I'll teach you all the Chinese proverbs you can handle.
Oh, God, Luigi's:
Snake: That guy with the mustache... Colonel: Ha. You mean the king of second bananas! Snake: Hey! That's Luigi! Show some respect! Colonel: Look at that pale skin. He's been living in his brother's shadow for too long. Snake: That's a low blow, Colonel! Colonel: Face it, Snake! Once a kid brother, always a kid brother! Snake: Colonel, what's gotten into you?! Colonel: La li lu le lo! La li lu le lo! La li lu le lo! Snake: Colonel, snap out of it! Colonel?! COOOOOOOOOOLONEEEEEEEEL!
On Marth, these two lines:
Mei Ling: Snake, have you heard the saying "politics make strange bedfellows"? Snake: Don't tell me that's a Chinese proverb.
Snake: What kind of weirdo puts their face on the bow of a ship, anyway? Mei Ling: Maybe he's a little narcissistic. Kind of like someone else I know... Snake: Really... And who would that be? Mei Ling: Use your imagination...
Mei Ling: Snake, have you ever heard the ancient Chinese story, "The Vain Ocean Of Wealth"? Snake: I've been waiting for the movie.
Discussing Peach and her relationship to Mario:
Mei Ling: But still, don't you think it's romantic? I mean, to have a guy who's always there for you? Snake: If he was smart, he'd tell her to stop getting kidnapped. Mei Ling: ...You don't get a lot of dates, do you, Snake?
Mei Ling: Could you catch Pikachu for me? Pleeeeeease? Snake: Oh, come on! What do I look like, a Pokémon Trainer? Mei Ling: Fine... Sorry I asked.
Otacon: He used to be a weakling, but countless trials over the years have toughened him up. Snake: By trials, you mean game overs? Otacon: Yeah, you'd know all about that.
On Pokémon Trainer:
Colonel: Let's do this together, partner. Snake: Whatever you say, Colonel.
Even better in context. (Colonel has just delivered a spiel on how soldiers and commanders rely on each other for maximum effectiveness, effectively making them a team. Snake is... skeptical of this viewpoint.)
Snake: Aw, there's a big eyeball walking around here... Colonel: That's just Jigglypuff. Snake: Jigglypuff? That some kind of marshmallow?
Oh, lordy, Sonic:
Snake: *grumbles* Otacon: Snake, what is it? Snake: Something about that hedgehog rubs me the wrong way. Otacon: ...oh, you mean Sonic the Hedgehog! But everyone loves Sonic! He's a big star! Do you have any idea how excited people are that he's here in Brawl? Snake: Yeah, I know, but there's something about him I just don't like. Otacon: But...why? You must have some kind of reason? Snake: ...nope. Just don't like him.
The Wild Mass Guessing this has spawned is incredible. So far, the most prominent theory seems to be that this is an Actor Allusion; Snake's Japanese voice actor's father voices Dr. Eggman.
Snake: Mei Ling, Samus took her clothes off! Mei Ling: That's Zero Suit Samus, Snake. Snake: Without that bulky Power Suit, she's gotten a lot more agile... maybe if I took off all this heavy gear I could chase her. Mei Ling: Uh, yeah, you wish. Snake: Her loss.
Luigi is there simply for comedic relief. His Subspace Trophy pose is different from his actual trophy pose in the game, to a funny extent. He was thrown into the cart upside down. Dedede even stuck one of his badges onto Luigi's trophified nose.
In one scene, Samus and Pikachu enter a room. It seems pretty safe and they're just walking along calmly when *SWOOP* ... Uh, what the heck just happened? Where's Samus? The pure Mood Whiplash of Ridley's entrance is quite funny.
This scene where Captain Falcon makes his grand entrance... killing almost all of Olimar's Pikmin in the process.
Right before Meta Knight battles Lucario, the cutscene cuts back to the Ice Climbers, who do a Loud Gulp.
Peach breaking up a fight between Fox and Sheik by offering tea.
Snake hiding from Lucario and Meta Knight in a cardboard box, then Lucario seeing through the box and picking it up, causing a "They'll never find me in - WTF HOW DID YOU KNOW?!" reaction from Snake.
When Mr. Game & Watch is revived, Peach lets him play with her parasol. Hilarity Ensues.
Ganondorf turning the trophy gun on Bowser. Even funnier is that about two seconds later, he gets swatted by Tabuu.
Even funnier is what Bowser does to Ganondorf's trophy afterwards. Disrespect does not begin to cover it. It's basically a montage of him attacking it in so many different ways...
Ganondorf is revived in a later cutscene, and is clearly a little groggy.
After defeating Bowser, King Dedede revives his trophy, leading him to retake his intimidating roars from before. When Dedede then nonchalantly dope slaps him in response, the giant Koopa makes a sulky "what the hell was that for?" gesture.
When Kirby and Dedede's group meet up near the end, Dedede immediately glomps Kirby, and then drags him off while Kirby has a complete "WTF?" look on his face. Priceless.
Wario gets a few moments of funny in the game:
His jaw dropping upon seeing Luigi and Ness help Dedede up.
His complete indifference to Master Hand's corpse.
Word of God stating that even though Wario joined the Subspace Army, he "cares very little for the actual objective he was given and wants to continue just doing whatever he likes."
The rest of the game
The original E3 2006 trailer opens with Mario, Kirby, Link, and Pikachu in their Melee models running towards each other on a black screen. Then, the Battlefield from Brawl appears in the background as everyone changes to their updated Brawl models... Except for Kirby, who didn't have a game of his own on the Wii at the time. Kirby himself looks confused.
Wario's role in the trailer. After several awesome moments, he crashes in on his bike, surrounded by the other characters. Wario gets up, sees the others, grins sheepishly... and then the waft begins charging. The Smashers recoil a bit and it cuts to Wario about to unleash it. We then get a split-second shot of everyone's Mass "Oh, Crap!" before the explosion.
The item description for Mr. Saturn. It just reads, "Pwaaaaah. Pwaaaaah."
In Brawl, Assist Trophies have a chance to spawn Mr. Resetti. Normally, this means you spend more than a minute with a huge text box spouting an angry rant at you. However, since Resetti is a mole, he's stuck on whatever platform he spawns on, which means his platform can collapse or scroll offscreen. If he does, not only does his rant end early, but there's a special, highly amusing line of dialogue for when this happens.
"H-hey! Don't you ditch me, punk!"
Anytime Resetti does an "impression" of one of the characters on the field. It only shows up as plain text, but it's hilarious to imagine him attempting to sound like one of the characters.
Brawl- takes the liberty of putting voice clips in hilarious places. Example: Snake's "Nom nom nom... Tasty." and Captain Falcon's "YESZ!!!" But by far Peach's forward throw takes the cake. "This is fun! *slap*"
Villager managing to give Mario a death glare◊ through that blissful expression. This caused Villager to gain Memetic Mutation status as a cold-blooded, psychotic killer within MINUTES of his announcement.
Mario's face when he almost gets hit by flying Metal Blades in Megaman's Reveal Trailer for Smash Bros. 4.
Mario, Link, and Kirby are "playing" Wii Fit, trying to hold the tree pose when she casually walks up, taps Mario on the shoulder, then strikes another pose, OHKOing all three of them.
What makes it even funnier is that after this, the game says "Great, keep it up!". It's as if she was encouraged for beating the crap out of people.
What also makes it funnier is how they do the pose. Mario can't get his arms over his hat, Kirby (having no legs) just puts his foot over the other and can't get his arms over his head because he's too round. Link (having a more realistically human shape than the others) is the only one doing the pose right, but he still has trouble keeping it.
The Smash Bros. Direct had plenty of these moments.
The various little fake-outs that were done, like pretending that Zero Suit Samus was deconfirmed, complete with showing an image of her Brawl incarnation fading to black and white, as if to say she is only a memory now.
How the Motion-Sensor Bomb is demonstrated: Link is standing close to Peach while Zelda is standing behind him, Zelda throws the bomb, then waves at Link to come over to her. Link falls for it hook, line, and sinker.
This is even funnier if you saw some of the pictures on the official website and the pics of the day, as there was a Running Gag of Link having an affair with Peach. Woman Scorned indeed.
In one of the Trophy Quizzes, the answer seems obvious that it is Palutena. But nope, it's Pseudo-Palutena. What makes it even better is that upon "her" reveal, the camera is zoomed in on "her" face to create a Jump Scare-like effect.
Even meaner is that this was done before Palutena's widely-anticipated reveal as a playable character, so the thought of her being a mere trophy caused many a proverbial heart attack. People were happy to be wrong.
Mega Man's Crash Bomber special lands on Yoshi's tail. The dinosaur spins around, (presumably trying to take it off,) before it explodes.
Villager's Pocket move continues to be hilarious, with the trailer showing him stealing a Spring from under Sonic, and stealing Zelda's summoned Phantom and then attacking her with her own Phantom.
A blink-and-you'll-miss-it moment during Rosalina's moveset explanation, when it gets to her Star Bits attack. Rosalina sends the Luma out to attack Diddy Kong, but this leaves her open for Donkey Kong to grab and carry her off in the background. The Mother of Cosmos was ape-napped. Also, Diddy Kong scratches his behind right before the scene change.
Sakurai's comments on Little Mac, ranging from his poor air moves (complete with funny graphic) and poor recovery (And That's Terrible) to questioning if Giga Mac and Little Mac are the same person.
In the trailer, Pikachu does the same when seeing Giga Mac, except he didn't run up to him and ran a way with Giga Mac following him.
When Charizard enters the fray, each of the fighters prepares to launch an attack. Link throws the Gale Boomerang, Kirby fires a star from the Star Rod, Samus fires a missile, Mario runs at Charizard head on, and Olimar? He throws a Pikmin at it, and the Pikmin doesn't even reach it.
At one point in Greninja's trailer, Mario and Luigi try to sneak up on Lucario and Greninja with Poké Balls in hand.
E3 2014. So how do you promote your Mii Fighters? By making Reggie and Iwata fight each other to the death, and then having their Miis duke it out.
How does she make her entrance? By activating Pit's Power of Flight to toss him away screaming.
When Palutena showcases what appears to be her Final Smash on Yoshi and Samus, she comes down and we're treated to Pit "crouching" while she merely spins, crosses her arms, and gives him a look while we hear him say "You don't have to prove anything to ME, Lady Palutena!" Those who've played Uprising can just IMAGINE the expression on his face.
Just as she mentions how the rest of the fighters are Worthy Opponents, the screen cuts to King Dedede doing his "crouching" pose.
Chrom is essentially a Butt Monkey in this trailer. Him being beaten by Captain Falcon isn't funny on its own, until you hear his only line in the trailer, practically lampshading how he's gotten the short end of the stick compared to his daughter and friend.
Chrom: I suppose I'll get my chance another day.
Then there's the bluntness of the text as Chrom's role in Robin's Final Smash is revealed.
Lucina isn't completely free of this herself. During the beginning, her debut states "Lucina wakes her blade?!" Then Robin shows up with his own debut card, and it appears as he's stealing the spot of both of his companions.
Robin gets a jab...or rather, female Robin. At the end of the trailer.
P.S. Also you can play as female Robin!
While it's likely a coincidence, his reveal trailer is named Looks like we don't have a choice!, which seems like a sly jab at the leak.
In the beginning, Bowser lets out a mighty roar....only for a butterfly to fly pass him. Even better, he gets distracted by said butterfly enough to let down his guard!
Shulk casually steals his friend's catchphrase.
Shulk: Now it's Shulk time!
Towards the end of the trailer, Shulk is seen jumping thrice. While the first two jumps have him in his normal clothes, the third one has him in his swimwear. The guy stripped his clothes off!
This official poster◊ shows silhouettes of her, Mario, Link, Kirby, Pit, Donkey Kong, and Samus doing the tree pose.
Sakurai confirms that Miis are going to be new fighters, and near-completely customizable, and admits that, with this new system, you can have media celebrities fight each other if you so choose, even showing examples like Ice-T, Elijah Wood, and Abraham Lincoln, complete with the announcement screens the game uses.
Pac-Man's promotional artwork◊ features 8-bit versions of several smashers in Pac-Man's iconic maze, all with some silliness going on such as Link holding a cherry in his Item Get pose, and Kirby eating a bunch of Pac-Dots.
The pic of the day for February 10 has this caption: "A bored-looking dog staring at the TV… Occasionally, the Super Smash Bros. series really makes me confused about what I'm creating."
This screenshot◊ posted on the Smash Bros. website after Zero Suit Samus was confirmed. Samus wearing a bunny hood is fanservice to the point where it borders on parody. Even better, Luigi and Dedede are right behind her, and Samus's expression gives the impression that she's not thrilled about this at all, or perhaps annoyed that they're ignoring her.
Hours before the big stream that revealed Lucina, Robin, and Captain Falcon, his Pic of the Day showed a trophy...of Rayman.
The caption for July 14th pic has even Sakurai wondering when Captain Falcon will get another game of his own.
The pic of the day for July 18th has Mario and Little Mac suffering a Screen K.O. But instead of simply bouncing off like in Brawl, their faces are smushed against the camera. Even better, the Villager is smiling on the stage.
This one's going to need a little context: before Meta Knight's reveal there was a picture highlighting the new feature of Mii costumes. One of the two Miis in the picture had Meta-Knight's mask on, which led to no little speculation on Meta-Knight's return. Fast-Forward to Meta-Knight's reveal pic with Sakurai speaking as Meta-Knight saying he "introduced that imposter to his sword". Yup, Sakurai just implied Meta-Knight straight-up killed a Mii for daring to steal his look.