One day I noticed my sister wasn't wearing a watch. When I asked her about it, she replied, "I don't need a watch. At home there's a clock in every room, and in the car there's a clock on the dashboard."
Knowing my sister's an avid shopper, I inquired, "Well, how do you tell time when you're shopping?"
"That's easy," she replied. "I just buy something else and then look at the time printed on the sales receipt."