Where do ghosts go on vacation?

The joke “Where do ghosts go on vacation? Mali-boo” is a play on words that combines the supernatural concept of ghosts with a popular vacation destination. Ghosts are often associated with the word “boo,” which is a common sound or phrase used to represent a ghostly scare. “Malibu” is a well-known coastal city in California, famous for its beaches and as a vacation spot. The punchline “Mali-boo” is a pun that merges “Malibu” with the ghostly “boo,” suggesting a holiday spot specifically for ghosts.