Coupon-come-backs!

"Thank you for shopping with us! If you go to this website and sign up on line they will email you 20% off any one item!" The customer thanks me and leaves with her $10 shirt. Only to return the next day with the printed out coupon and the $10 shirt. "Hi, yes I was here yesterday (Yes Cyndi Lauper I remember you.. it hasn't even been 24 hours!) and I would like to return this shirt and rebuy it with the coupon." This is when I have to prevent myself from the are-you-kidding-me stare? You just wasted $8 in gas to save $2 on a shirt. This, people, is why we are in a recession. Stupid people, you're bringing us down!!!