Heathers (1989)

Heathers (1989) is a movie aptly named for the three most popular girls where Veronica (Winona Ryder) goes to school. Veronica badly wants to be a part of the in-crowd and leave her good girl shoes behind her—until she doesn't, of course. She has no idea how to shake this evil clique until she meets a rebel (Christian Slater) who gives her a new idea entirely: Just kill them and get it over with. Surprsingly light and funny, this movie follows Veronica as she tries to do normal things, like get into a good college and stop arguing with her sociopathic boyfriend, all while she's slowly killing off the cool kids at school. 

No high school romance is complete without sex in the park, and Christian Slater doesn't disappoint. The two play strip croquet (where do we sign up?) before lying down together in the grass, Christian's shirtless chest exposed. Two of the menacing couple's victims are popular dudes Lance Fentron and Patrick Labyorteaux, who think they're going to double team Winona and strip for her only to find that she is going to shoot them instead. Don't you just hate it when that happens.