A Straw and Two Glasses

It was a dark and stormy night. Unable to continue driving, two truck drivers, John and Bill, were stuck at the (clever name here) Truck Stop and decided to have dinner together. At the end of their meal, Bill noticed that his water glass was empty while John’s glass was still full. Bill was terribly thirsty, and since the waitresses were extremely busy, he stuck his straw in John’s glass, put his finger on the top to trap water, moved the straw over to his glass and released the water.