What do you call a ghost bee?
Boobees.
Okay, listen up, you absolute genius. You know, the kind of genius that thinks putting socks on a cat is a good idea. Anyway, let me break this down like a Lego set for a toddler. The joke plays on the fact that 'boobees' sounds like a plural of 'boo', which is something ghosts say. The word 'bee' makes you think about the insect, so the answer has the sound you expect but a different spelling and an association to 'boo'.
Daddy Randall
LOL