Best/Worst Classes Topic :D

So some friends and I were discussing the derpiness of some of our courses and how deliciously useless they will be to us (Harry Potter Mythology? This is a thing, I kid you not).

Last semester I muscled my way through Philosophy of Art and Criticism. Worst. Class. To date. I thought it was going to be useful, yet I retained NOTHING! (Bad mix of bad professor, language barriers, tedious subject matters and "what is art" discussions)

The absolute best class I've ever taken ever is a tie between my British Literature class in high school (best excuse to read all the best books) and the History of Science (oh, Copernicus, how I admire you) and Mesopotamian History classes (I now have an obsession with cylinder seals) I took sophomore year of college.

Middle school, high school, college, grad school, ect..What was the worst and best class you've ever had the displeasure/unbridled joy to sit through/sleep through/take over class discussions in?