Get done final exam in one class I was super worried about and think, wow, that wasn't so bad, I think I'll get a pretty good grade!

Next class, feeling confident, I volunteer to do presentation that I wasn't even done with, unprepared and on the spot, and begin stammering and freezing in front of everyone, forget how to read my notes somehow, stand in silence in front of a blank projector for actual minutes. The day would have been amazing if I didn't do that