Bad Education - Rotten Tomatoes
Alma movie: The Breakfast Club (1985)

The Shermer High kids may be in afternoon detention, but Principal Vernon's really the guy who should be locked up and writing lines on the blackboard. With his preconceived stereotypes of who the teens are and his cruel attempts to break them down (locking Judd Nelson in a closet for hours, for one), he's everything a John Hughes movie takes a stand against.