What do you call a duck in a monster costume?

A quack-ula!

What's a vampire's favorite fruit?

A neck-tarine!

Why did the werewolf try to book an appointment at the dog groomer?

He heard they give excellent howl-cuts!

Why did Frankenstein's monster get kicked out of the library?

Because he kept reanimating the classics and they didn't want any more shelf-life issues.