Why is it so cheap to throw a party at a haunted house? Because the ghosts bring all the boos.
Haunted House Party
Explanation
Explain Bear
Listen up, buttercup! This joke is playing on words. "Boos" sounds like "booze," which is what people drink at parties. But, see, it also refers to the sound ghosts make, so they bring the "boos" to the party. Get it? Or are you still counting your toes?