Cashier: “Aisle 5.”
Minutes later the man returned with a bag of cotton balls and some string.
Cashier: “I thought you were buying tampons.”
Man: “I was, and then I got to thinking about something. The other day I asked my wife to pick me up some cigarettes while she was out, and she came home with a tin of tobacco and some rolling papers. Her reasoning was that it was just SOOO MUCH CHEAPER. So the way I figure it, if I have to roll my own, then so does she.”