not really an LFS story, but a great story none the less. a friend of mine works at a local CVS as a cashier. One day, a woman came in and bought about $25 worth of stuff, and then handed my friend enough coupons to get her bill down to 54 cents. finally, she gave him one last coupon. he looked at it, then looked at the customer, looked at it again, and told her "im sorry maam, i cant accept this coupon" the customer then told him that he should honor coupons, blah blah blah, they accepted it last time. he then tells her, "maam, this is CVS. there is no way we have ever accepted this coupon, it says that it is good for a free oil change at jiffy lube."
its amazing what people will try when they want to save money.