"A visiting professor at the..." joke

A visiting professor at the University of Alabama is giving a
seminar on the supernatural. To get a feel for his audience, he asks: "How
many people here believe in ghosts?"
About 90 students raise their hands."Well that's a good start. Out of
those of you who believe in ghosts, do any of you think you've ever
seen a ghost?"
About 40 students raise their hands. "That's really good. I'm
really glad you take this seriously. Has anyone here ever talked to a
ghost?"
15 students raise their hands. "That's a great response. Has anyone
here ever touched a ghost?"
3 students raise their hands. "That's fantastic. But let me ask
you one question further... Have any of you ever made love to a ghost?"
One student in the back raises his hand. The professor is astonished.
He takes off glasses, takes a step back, and says, "Son, all the years
I've been giving this lecture, no one has ever claimed to have slept
with a ghost. You've got to come up here and tell us about your
experience."
The redneck student (remember, this is Alabama) replies with a nod and
begins to make his way up to the podium. The professor says,
"Well, tell us what it's like to have sex with a ghost."
The student replies, "Ghost?!? Damn, I thought you said 'goats.'"