In the end, I always just accept it and move on, because really, it's my fault and getting annoyed at the professor is just a lame way to shift the responsibility away from myself.
I got my calculus test back and I did well...but not as well as I hoped. For some reason, I tried to solve an improper integral using integration, after being warned that doing so would result in absolutely no credit. It brought my grade down by 10%. I would have had an A+. It would have brought my overall grade up to a solid A.
The only real complaint I have about the test was this: I hate the red question mark. To me, it says one of two things: either "I don't understand what you were trying to do here" or "what the hell were you thinking?" Now, it's pretty clear what I was doing...I simply went about solving the integral as if it weren't improper. I know my teacher knew this. So, what I took from his little scribble was, "what the hell were you thinking?" I already ask myself that enough, thank you...I don't need another voice to add to the cacophony inside my head.
Then again...maybe I should toughen up a bit. Or, maybe he simply expected more from me and I should take the big question mark as a compliment.