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Raiden's "Thanks for the practice"
Spike's "You'lll never win!" taunt. (Slap)
Cole when he juggles ice. "YOU CLOWNS NEVER LEARN"
Sly saying, "CHASING SHADOWS AGAIN?"
Sir Daniel's chicken dance is the absolute best. Especially in 2v2, after you get a team double kill and you and your team mate dance together.
Second best is PaRappa's "Cash money, son!" Too bad it's so quiet.