What’s a ghost’s favorite dessert?

A ghost's favorite dessert is... "Boo-berry pie!" 👻🥧

Explanation: Ghosts are often associated with mysterious and spooky things, so their favorite dessert would naturally have a playful and ghostly twist to it. "Boo-berry pie" sounds like "blueberry pie" but with a mischievous ghostly twist, making it a hilarious choice for their favorite dessert. The use of the ghost emoji adds an extra touch of whimsy and humor to the answer.