Funny things to do at school?

Answer 1

Oh, that's an easy one. If you can get into the classroom before the teacher, and if they're classroom phone is hollow, find a way to open it up. Every day, put a single nickel (or any small object with some weight) inside the phone. After several days of doing this, once the teacher has gotten used to the weight, take them all out. The teacher will probably hit themselves in the face or send the phone flying across the room. :D