I think out of everybody at my community college, I have the most issues with my English professor. She always starts class several minutes early so even when I'm on time, I'm late. The thing that bothers me most is when I walk in there after she has closed the door. It is so awkward going in there especially since she says absolutely nothing about it. I'd much rather be put on the spot by having words directed at me than everyone just kinda watching silently as I make my way through the front of the class, past her desk, and to my seat.
My calculus teacher is cool though. I once got into class 15 minutes late due to car trouble, thus missing over 25% of the class time. He just said, "Good morning!" as if I'd walked in normally and just resumed writing on the board.