20th Century Fox
Played by: Megan Fox
It’s nearly impossible to out-psycho a chick when she has a demon inside her. Mere mortals can wave butcher knives and sledgehammers, but Jennifer has the jaws and teeth of a bear trap. She doesn’t kill because of daddy issues; she kills guys because they’re the only food that sustains her. Add to that her superhuman powers and complete disregard of physical laws, and you’re left with one bad honey. The only reason she’s not No. 1 is because demons are always eventually defeated in horror films.