"The Old Couple" joke

A young man saw an elderly couple sitting down to lunch at
McDonald's. He noticed that they had ordered one meal, and
an extra drink cup. As he watched, the older gentleman
carefully divided the hamburger in half, then counted out
the fries, one for him, one for her, until each had half of
them.

Then the old man poured half of the soft drink into the
extra cup and set that in front of his wife. 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 allow him to
purchase 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 then asked the wife if she was going to eat,
and she replied, "Not yet. It's his turn with the teeth.