Oldies on the go

An interstate bus company gets the job to take some senior citizens for a tour from Melbourne to Sydney, via all of the well known tourist stops.
The trip started out pretty quietly but after a few nights the travellers were getting to know one another and started swapping seats etc.
On the third night, as they were arriving into the next town a bit late and after dark, an elderly woman goes up to the driver,"I've just been molested!" she says.
The driver had a pretty good idea of his passengers by this time and didn't think any were the type to "try one on" with any of the ladies.
He thought she had probably dropped off to sleep and dreamed it.
He reasured her and told her to go back to her seat and sit down.
A few kilometers further down the road another old woman comes forward.
She also claims that she was just molested.
The driver thinks he must be driving a bus load of wierdos.
Who on earth could be molesting those old ladies?
He keeps driving, but, about 10 minutes later, a third old lady comes up and says that she'd been molested too.
The bus driver has had enough of this nonsense, and pulls into the next rest area.
He turns the lights on and stands up.
And ... he sees an old man on his hands and knees crawling in the aisles.
"Hey you, what are you doing down there?" asks the driver. "You are scaring the wits out of all of the ladies.
...."I lost my toupee. I thought I found it three times, but every time I grab it, it keeps running away..."