"Heathers" (1989)

Black-as-soot comedy about a set of alpha-female rich girls who make everyone’s high-school experience a living hell — and a “Heather” (actually a Veronica, played by Winona Ryder) who rebels against them. LESSONS LEARNED: The worst thing to say before you die is "Corn Nuts!"; Christian Slater's behavior can be even more dangerous than his acting; people love their dead gay sons. Also, authority run amok must be quelled.