The best affliction one can obtain in a scary movie. Werewolves can only be killed by silver whereas vampires are killed by crosses, stakes, holy water, and the death of their vampiric leader. According to the movie Van Helsing, the only thing that can kill Dracula is a werewolf.
Dracula: Ima bout' ta take over tha world!
Regular Guy: Oh Sh!T! Full moon! -changes into a werewolf-