At a conference on the supernatural, one of the speakers asked, "Who
here has ever seen a ghost?" Most of the hands go up. "And how many
of you have had some form of interaction with a ghost?" About half
the hands stay up. "OK, now how many of you have had physical contact
with a ghost?" Three hands stay up; there's a slight murmur in the
crowd. "Gosh, that's pretty good. OK, have any of you ever, uh, been
intimate with a ghost?" One hand stays up. The speaker blinks.
"Gosh, sir, are you telling us that you've actually had sexual contact
with a ghost?"

The guy with his hand up suddenly blushes and says, "Oh, I'm sorry, I
thought you said 'goat'."