I define the worst to be the most unpleasant for me, so anything played by Chuck Norris because he's the worst actor out of all the actors who are famous. Or any of the characters in The Usual Suspects because they were so evil I couldn't stomach it and didn't even finish the movie (I've only quit watching two movies out of all the movies I've watched; the other was Gummo). Or maybe Marcy Dawson from Pi: "You don't understand it, do you? I don't give a shit about you! I only care about what's in your fucking head!", that was the most bleak movie I've ever seen, and my least favorite of all the ones I've actually finished. And that's the statement that stood out to me the most from it.