Sharing

I stopped at a fast food joint for a meal while on a trip. I noticed a couple old enough to be my parents. The man cut the burger in half carefully, and then handed half to his wife. Then he counted out the fries, dividing them equally. He then put two straws into the soda, and took a sip. The woman started eating slowly, as the man watched and chatted. I walked up and offered to buy another portion so they could have enough. The man thanked me, and said, No, we always share everything. As I finished up my meal, I offered once again to buy them another burger and fries. He repeated what he said before. No thank you, we share everything. So I asked him what he was waiting for. He looked up in surprise and said, Why, the teeth, of course.