First if someone got you really mad. While that person is sleeping.Get a bucket of warm water.Put her hand in it.Go back to bed.When you wake up.There will be something wet on her bed.
1.get a handwriting pen shake it really hard but dont let anyone see you wait for someone to open it, there will be ink all over them
2.put a pin on a teachers chair and when they sit down in agony tell the teacher someone else put it on the chair
3.sneak your phone into class,make sure you dont get caught!basically start playing music the teacher will be puzzled trying to find out who is doing it!