I stopped at a fast-food restaurant recently. I was fascinated by a sign which offered Fat-Free chips. I'm on a diet so I decided to give them a try.
I was dismayed when the bloke pulled a basket of chips from the fryer, which was dripping with fat. He filled a bag with them and asked If I wanted salt and vinegar.
"Just a minute!" I said. "Those aren't fat-free."
"Yes, they are. We only charge for the potatoes . . . the fat is free!"