An old cowboy walks into a barbershop in Dillon, Montana for a
shave and a haircut. He tells the barber he can't get all his whiskers
off because his cheeks are wrinkled from age. The barber gets a little
wooden ball from a cup on the shelf and tells the old cowboy to put it
inside his cheek to spread out the skin.

When he's finished, the old cowboy tells the barber that was the
cleanest shave he'd had in years, but he wanted to know what would have
happened if he had accidentally swallowed that little ball. The barber
replied, just bring it back in a couple of days like everyone else
does.