BOO! Nothing is quite as scary as ghosts. Yes, Freddy Krueger, Jason, and Ghostface from Scream are pretty frightening figures, but at least you can kill them! There's nothing you can really do to ghosts, and forget about killing them - they're already dead! Here are 10 of the most prominent ghosts in pop culture. And no worries about getting too scared: most of these ghosts are happy and adorable!