The Perfect Revenge On My Teacher?

Im in 8th grade and i will go to highschool next year...I want to have some fun and prank the crap out of my homeroom teacher before i go to highschool.....Not just because i want to have fun, but because i want to get REVENGE also. She has been treating my friend like a piece of sh*t and stalking him.......We all have issues with her....No one likes her, shes always acting bit*hy with us. Once, we were acting so bad that she said she didnt want to be our homeroom teacher and left, crying. Then, two days later, she came back.......She has issues so help me out here plz..........