Why won't anyone...

Why won't anyone kiss Dracula?
He has bat breath!

http://www.factmonster.com/spot/monsterjokes1.html

What did the snake say when ...

What did the snake say when he was offered a piece of cheese for dinner? Thank you, I`ll just have a slither.

http://www.jokes-db.com/jokes/monster-jokes

What do you give...

What do you give a sick snake? Asp-rin.

http://www.jokes-db.com/jokes/monster-jokes

What did one slug say to ...

What did one slug say to another who had hit him and rushed off? I`ll get you next slime!

http://www.jokes-db.com/jokes/monster-jokes

What lives in apples and ...

What lives in apples and is an avid reader? A bookworm.