Good idea for a student teacher! Teacher's survival kit: Animal cookies for when your classroom seems like a zoo. Band Aids for when things get a little rough. Chewing Gum to help you stick to it. Crayons to color your day bright and cheerful, and more.
Every word problem back in elementary school. I've also had derpy teachers who have accidentally made impossible word problems. so we would freak out thinking we didn't study enough to find out our teacher apparently needs to go back to school.