Pre-calculus/math analysis. I had enough trouble with real numbers in three dimensions, and then the teacher introduces imaginary numbers in the fourth dimension. I would have rather listened to the Fifth Dimension or talked to some imaginary friends.
Somehow I passed, mainly because I "showed all my work" by throwing down a random series of numbers and constructing a graph in the shape of a U. As long as I filled the "work space" with something vaguely mathematical, I received partial credit.
The teacher once gave us a problem: "A sniper leans out of an airplane traveling 500 kph and attempts to shoot a man with a perfectly elliptical head. What are the chances that he will hit the man in one of the foci?" (I'm sure there was more to this question like wind speed and trajectory and other information that DOESN'T MATTER TO A FUTURE ENGLISH MAJOR.)
For my answer, I drew the scene and used Charlie Brown for my target. Then I wrote, "If the victim is Charlie Brown, the man has a 100% chance. Charlie Brown never wins. If the victim is anyone else, the sniper has a 0% chance."
I think I earned 1 point out of 10 for creativity.