What do you find scary? Killer clowns? Ghosts? Zombie attacks? You're not alone if you've lost sleep over any of these nightmarish ghouls, or at least checked that all the doors and windows are locked after turning off the TV. Of course, it doesn't have to be a monster that spooks us: In the right hands, anything can be scary, even a statue or a toy telephone.
Here are 13 TV episodes that made our hearts race, from "Buffy the Vampire Slayer" to classics like "The Twilight Zone."