Bob goes to Andrews butcher shop to buy a steak for dinner, Andrews wife is looking after the shop while Andrew is away on business and she does not know how much to charge Bob so she tell him that he can pay her husband next time he sees him.

Well Bob goes home cooks his steak then watches the football game and turns in for the evening, next morning he heads down to the post off and be darned if he doesn't run into Andrew the butcher so he asks how much do I owe you for the meat I got off your wife yesterday.

Andrew replies Oh forget it, your wife don't charge me anything.