Bill Paxton is the first person Arnold kills in "The Terminator". "Give me your clothes." Heh.
Keith David's fight with Rowdy Roddy Piper in "They Live" is either top three or number one the best one-on-one knock down drag out fist fight in cinematic history.
I take back my earlier comment that Bill Paxton has never done anything special IMHO.
I forgot he was Chet in Weird Science and he was funny as hell in that role.