An elderly couple is in a McDonalds.

The old man goes up to the counter and orders a quarter pounder, a small fries and a small drink and brings it to his wife in the booth.

The man cuts the hamburger in half and gives half to his wife. He counts out the french fries, one at a time, giving one to himself and one to his wife until they're all counted.

He then pours half the soda into another cup and keeps half for himself.

An onlooker is overcome with sympathy for the poor couple and approaches the table and says "I'm sorry. I don't mean to be rude, but I couldn't help notice you are sharing one meal. Can I buy you another meal?"

The old man says "Oh no. It's not what it seems. We have been married for 62 years and we share absolutely everything. It's what has made our marriage last for all these years. You really appreciate a person by sharing everything like we do.

The onlooker apologizes and goes back to his table.

The old woman starts eating, but the old man just sits there, watching her.

This goes on for about 5 minutes, and the onlooker is dying of curiosity. Why wasn't the man eating.

He approaches the table again and says "I'm sorry to bother you again, but I noticed that you weren't eating. I was just wondering what you were waiting for."

The old man replies "The teeth."