A senior citizens' group charters a bus from San Angelo, TX, to Branson.  As they entered Missouri, an elderly woman comes up to the driver and says, "I've just been molested!"

The driver figures she had just fallen asleep and had a dream, so he tells her to go back to her seat.
A short time later another old woman comes forward with the same story, she'd been molested; and about ten minutes later another old woman comes forward saying she had been molested.

So the driver figures it's time to get to the bottom of this, so he pulls into a rest area and turns on the lights.  The first thing he sees is an old man on his hands and knees crawling around in the aisles.

"Hey Gramps, just what the hell is going on down there?" asks the driver.

"I lost my toupee. I think I found it three times, but every time I grab it, it up and runs away.."