"Dey Ain't No Ghosts", by Ellis Parker Butler
(in Humorous Ghost Stories, compiled by Dorothy Scarborough)
Erm, this one is even more likely to offend some people... Add to that the facts that it's repetitive and the punchline's not even that funny, and I think you're safe skipping it. It is, however, somewhat remarkable in that it is written in some of the thickest dialect I have ever come across.
At least it was relatively short.