Horror filmmakers have a special fondness for shedding teenage blood.

After all, teens are horror's primary audience, so it's especially frightening -- and cathartic -- to see teens like themselves targeted by deadly evil, often just for behaving like normal adolescents. In the last four decades, movies about teens targeted by slashers have become the mainstay of movie horror.

With "The Gallows" hitting theaters this Friday -- a teen horror movie with echoes of "Carrie," "Prom Night," "I Know What You Did Last Summer," and more -- it's worth looking back at some of the most celebrated teen horror movies of all time. Just remember, don't separate from the group, and don't have sex.