How to prank a teacher who constantly gets me in trouble for no reason (racist)?

i want to pull a prank on my teacher who absolutely hates me and my friend and gets us into trouble every 5 seconds. We are good students except she has no clue how to teach the cl and always makes US stay back and clean up the cl when everyone else is misbehaving more then us. i wont mention my race but im pretty sure its some racism....don't want to report her just want to do something funny to her and she can never catch me for it? any ideas?