wow, i have so many. lets see, a few from the top of my head would be...
jack nicolson as the joker in batman, along with the black guy who was whooping michael keatons ass for a bit in the bell tower final scene.
umm... everybody from "the crow".
ed harris as the german sniper in "enemy at the gates".
schwartzenegger from the 1st terminator. for walking into the police station and blowing everybody away.
the monk adam sandler fought in anger management. also, bob barker from happy gilmore.
hmm... i have a mental block right now. i can't think of anymore at the moment.