A few things I thought of:
My orchestra teacher makes me so mad. She yells at everyone over a single wrong note.
When people think I'm quiet and/or shy. I might appear to be quiet, but I'm definitely not.
Today at the last day of SAT class, the English teacher really annoyed me and I was just so bored. I talked with my friend sitting next to me, because she was stressed(I was, too) about taking the SAT this Saturday. I just wanted to talk it out and make her laugh, so I did. Later, he kept calling on me to answer questions and then he was like "Do you even know why i keep calling on you??" It's not our fault we were stressed and just needed to lighten ourselves up...