It's wrong to pull pranks.
Tate was sitting in his desk in the classroom of his least favorite teacher.
Tate wants to get switched to another class.
Tate talks to the counselor at school about taking another class.
Tate puts a thumb tack on the seat at his teacher's desk.
Tate is able to substitute another class for the one that he is currently taking.
Tate injures the teacher and gets kicked out of the school for the rest of the year.