I'm huge fan of thrillers (mostly crime thrillers) and science fiction movies. Star Trek got me heavily into science fiction, thus certain Star Trek movies such as the First Contact and The Wrath of Khan are among my favorites. Terminator 2: Judgment Day, Alien series, Star Wars the original trilogy as well among many other. As for thrillers, Fight Club, Memento, The Usual Suspects, The Prestige, ..., there's certain pattern here, all movies with great twist to them.

Horror would be my least favorite genre. It's not because I'm easily scared, it's just the opposite, most horror movies I've seen failed to scare me, quite terribly while I'm at it. I find horror movies to be usually cheap and kinda funny to be honest.