A man drinks a large tot of whisky every night before bed.
Fed up with years of this, the wife wants him to quit; she gets two glasses, filling one with water and the other with whisky.
After getting him to the table that had the glasses on, she brings out his fishing bait box.
She says "I want you to see this."
She puts a worm in the water and it swims around.
She puts a worm in the whisky, and the worm dies immediately.
She then says, feeling that she has made her point clear, "What do you have to say about this experiment?"
He responds by saying: "If I drink whisky, I won't get worms?"