A man saw an elderly couple sitting down to lunch at a fast-food restaurant. He noticed that they had ordered just one meal, and as he watched, the older gentleman carefully divided the hamburger in half, then counted out
the fries until each had half of them. The old man then began to eat, and his wife sat watching, with her hands folded in her lap.

The young man decided to ask if they would let him buy another meal for them so that they didn't have to split theirs.

The old gentleman said, "Oh, no. We've been married 50 years, and everything has always been and will always be shared 50-50."

The young man asked the wife if she was going to eat, to which she replied, "Not yet. It's his turn to use our teeth."