William A. Zeppeli's backward running animation. There are no words for how goofy it looks.
Joseph's taunt. He says "Your next sentence is: <opponent's taunt>". Then the opponent is forced to taunt and his/her "taunting panel" appear, then they realize what Joseph did and their "taunting panel" is changed to their "being taunted panel".
Even funnier is how he literally imitates Part 3 DIO's "WRYYYYYYYYYYYYYYYY!" and Valentine's "DOJYAAA~N!"
Made even more funny how imitates the way Iggy chews his gum.
And even MORE funny how he imitates Baoh's "BARUBARUBARUBARUBARUBARU!"
His GHA. Josuke heals his opponent to full health, then batters them so badly, they're worse off than before. Especially in the case of Johnny. Josuke's heal allows him to stand again, but the ensuing beatdown cripples him once more. Looks like the only thing worse than insulting Josuke's hair is mockingly complimenting it.
Johnny: Dryly and sarcastically compliments said hairdo, saying it looks "super great." But of course, Josuke detects sarcasm and gets his powerup anyway.
Baoh: Since Ikuro/Baoh can't talk properly, the narrator speaks for him claiming that Baoh doesn't like how Josuke's pompadour smells. Yet Josuke still figures it out, gets pissed off and takes it out on poor Ikuro.
The last part of Okuyasu's super move. After a painful beatdown with The Hand, Okuyasu gives his opponent a badass glare and a smirk...then a flowerpot comes out of nowhere and whacks him in the face.