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 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?!? I thought you said 'goats'."

Alternate way to tell that joke is that the student says that everybody's he's ever slept with are ghosts. By the next morning, they disappear and he never sees them again.

But goats is better :)