A young couple were making passionate love in the guy's van -- you know, shag carpets, big double bed in the back, all of that -- and suddenly the girl, being a bit on the kinky side, yells out:
"Oh lover, whip me! Please whip me!"
Well, the guy, not wanting to pass up an opportunity like that, but unsure what to do as he has no whips around, gets an inspired flash, opens one window, snaps the antenna off his van, and proceeds to whip the girl until they both collapse in sado-masochistic ecstasy.
Almost a week later the girl notices that the welts she sustained are beginning to fester a bit and goes to her doctor. The doctor takes one look at the wounds and exclaims, "Wow! ... Looks like you've got a bad case of Van Aerial disease!"