Props must be given to Dee Jay for managing to speak over Rufus with only a few words.
Complete the game (read: beat Seth) as Dan in IV, and the first thing Dan says in his win quote is him asking where his prize money is, and if it comes in the form of a Giant Novelty Check.
Do it with Makoto and she basically says the same thing.
The real Dan comedy comes when fighting Oni. Dan doesn't even realize he won.
GUY AND BISON'S KO CRIES. "Profound, sadness..." "NOOoooOOOOooOOOOOO!!!" There are other hammy ones in the game, but these REALLY stand out...
Guy's Japanese KO cry is "Munnen!" (something like "what a shame", afaik) and Bison's is a Big "WHAT?!" as hammy as only Norio Wakamoto can deliver. Still funny as heck, tho.
Let's not forget Balrog's "MY FIGHT MONEY!"
While nearly every character's game over screen shows them collapsing on the floor, some even crying out of frustration and anger, Cody's game over screen shows him yawning and stretching before lying on the floor to take a nap, not giving a crap that he lost.
Another variant of that pose doesn't have him whistling... but he instead says "Geez, yousuckman!"
Yun's ending. As they boys come back home, they see a VERY pissed Houmei running up to them. What does Yang do? Trip Yun so he can't escape and Houmei can drag him back home by the ear. Fucking hilarious.
Using Akuma's Wrath of the Raging Demon Ultra on the opponents causes them to yell out their KO cries as Akuma beats them. Using it on Balrog results in him yelling about his fight money whilst being pulverized by Akuma. One has to wonder what's going through Akuma's head when that happens.
Seth's Ultra's, sweet God, Seth's Ultras. They double as Narm and one constantly asks themselves (particularly for the Japanese version): "THIS guy is the final boss?" The first one especially stands out: his laughter in the first Ultra is notoriously cheesy (the English line before that was "Become apart of me...") and it basically looks like... well... you know (the victim's face makes it even more hilarious to watch).
Hakan's Oil Rocket. He grabs them in a bearhug and squeezes them so hard they pop out of his arms and go flying.
The entirety of Zangief's rival match against Abel. Particularly the introduction cutscene:
Zangief: You look like you're worried about something, Comrade! Fighting is the best thing to do when life gets you down! Alright, I'm going to help you out!
Even better, Abel's win quote on that particular match reveals he doesn't even realize he is fighting Zangief until AFTER winning against the Red Cyclone.
Since everyone has a special sound byte when defeating their opponent—which differs between normal, Super and Ultra finishes—you can finish Abel off with his Ultimate Atomic Buster, and he'll go, "I bet you feel so much better now, huh?"
And of course, there's Zangief's Winquote for that particular fight, which he can say right after the above moment:
Zangief: What, that wasn't enough? If you insist, I'd be happy to throw you some more!
Hugo starts off Ultra being confronted by several gang members in what should be an epic brawl. He stomps out of his trailer, making the ground shake with each step, gulps down an entire can of potatoes...and then starts bawling because he misses his mother's home-grown potatoes. It must be seen to be believed. Thus he begins a quest to become "the big potato", and he succeeds. Yes, Hugo, you ARE the big potato!
Can't mention Ultra's new endings without Poison's. Namely, that she has a band. A band composed of herself, Hugo, Rolento, Guy, Ryu, Ken and Cody. With KISS-style make-up. Refuge in Audacity doesn't being to describe it.
"Medic! I've been poisoned!". No, Rolento isn't actually poisoned. He just ran into El Fuerte.