Majinn Vegita's infamous evil smile. He looks at hit target, tilts his head sideways, and makes a huge, evil looking grin. The way it sounds, it's stupid, but if you've ever seen that episode, you know what I'm talking about.
Also, one where after you win a fight, you could use an emote to have your villian quickly turn around (capes fly up into the air) and he just walks away.