A group of retirees are on a bus trip when an old lady comes up to the driver and complains about being molested. The driver wonders who would want to molest her, and so tells her to go back and sit down.
Later, another old woman approaches and complains about molestation, and the driver tells her to go back and sit.
A third old lady screams and so this time the driver goes to investigate. He finds an old man on his hands and knees, and so he asks him what he's doing.
The old man says, "I'm trying to grab my toupee. Each time I grab it, it jumps and runs away screaming."