There is a little drug store near my office, where I sometimes stop in for odds and ends on my way to or from work.
Sometimes, under the things I need, there are signs like "Save ten percent with your club card." Or "Regular price, $2.00; Member price, $1.75." I have one of the cards (conveniently located on my keychain), so if I notice one of these signs, I try to remember to show my card when I check out.
The other day, I stopped at the drug store to get a few things on my way back from lunch. I picked up two things, but when I got to the cash register, I realized that I had forgotten to look to see whether I would save by showing my card.
So I told the cashier boy, "I have one of these cards. I don't know if it'll make a difference."
I figured he might know whether any of the items I was buying were on sale.
"Actually, yeah," he responded, "You should give your card every time you buy something. Because we started this new thing. It's gonna be, like, for every dollar you waste here, you get some points, and then you get stuff with the points."
Yes, that's right. He said "waste." Way to market it.