This joke is from my Grandma Rahl......
An old couple was in Burger King, and they ordered one meal. They divided up the fries and burger and the woman began to eat. A man saw this and offered to buy the couple another meal, so they both could eat. They replied, "Oh, no thanks, we share everything!"
"Well then, why aren't you both eating?" said the friendly customer.
The old man replied, "Oh, it's her turn with the teeth."