Blades (especially sharp shiny ones). Black cloth. Chemical reactions. Physics. Stuff like that.
My next target. The guy who created the thong. Never liked those things.
Mozart, Straus, Tchaikovsky, Bethoven.
Equilibrium. American Ninja (I know, it's really, really bad, but funny. Come on!). Elektra. Others.
Kung Fu, Black Scorpion, Samurai Jack.
Anything by Eric van Lustbader.
Sun Tzu.