Here are some of my favorites:
Why is Dracula so unpopular? Because he's a pain in the neck!
What do you call a witch who lives at the beach? A sand - witch!
How do you know that a vampire likes baseball? Every night he turns into a bat!
Why didn't the skeleton go to the party? Because he had no BODY to go with!
Why are graveyards so noisy? Because of all the coffin!