Replying to Hit and run

i park my car at 7:15 am in our high school junior parking lot. get out, go to class, fiddle my thumbs a bit, come back out for lunch at noon, and there it is. a 1 ft x 1ft, 3 inch deep dent on the rear drivers side just above the wheel and behind the gas tank. nothing to tell me how the fuck that got there. good thing our school has survailence camera's, once i watch those and figure out who it was, im going to strangle them to death