Somehow Andrew McCarthy’s journalist from “St. Elmo’s Fire” didn’t make the cut. Those who did, in no particular order (save for #1):
Robin Williams, “Patch Adams.” If I was on life support and Robin Williams showed up at my bedside in a clown’s nose, I’d pull the plug.
Michael Rapaport, “Beautiful Girls.” For this speech alone:
Kevin Costner, “JFK.” A heroic spin on an alcoholic conspiracy theorist with the worst Southern accent in move history.
Leland Orser, “Very Bad Things.” Immorally bad. Leland Orser is the other guy in glasses (not Daniel Stern).
#1: Ethan Hawke, “Reality Bites.”

Thank God I have seen only one of those movies, “JFK”. But I watched the clip from “Reality Bites” and I have no quarrel with your including Ethan Hawke on this list. I wanted to see Cartman kick him in the nuts.