A science teacher set up a simple experiment to show her class the danger of alcohol. She set up 2 glasses, one containing water, the other containing gin. Into each she dropped a worm.
The worm in the water swam merrily around. The worm in the gin quickly died.
“What does this experiment prove?” she asked.
Little Johnny from the back row piped up: “It proves that if you drink gin you won’t have worms”