High School: Geometry. Postulates, which by definition are statements made without any proof.
College: Philosophy. Didn't need it to graduate, and the only class I ever dropped. I hung in for the first few weeks, but when the Professor posed questions, the first answer that always came into my mind was "why would anyone care?"
Looking at the two subjects, I guess my dislike for both is because I am a person who sees things as black and white, fact or fiction, with little gray area in between.