An old lady on getting on a bus offers the bus driver some peanuts, the driver happily accepts and munches away.
Every 5 minutes she then gives him some more peanuts....
After a couple of trips then the driver asks politely
Driver: "Why dont you eat the peanuts yourself?"
Old Lady: "I cant chew, look I have no teeth."
Driver: "Then why do you buy them?"
Old Lady: "Oh I just love the chocolate around them"