Fjones' peeve and ali's response reminded me of a pet peeve I have:
There's a chemist near my work that I often get my prescriptions from at lunchtime. A few times the girls behind the counter offered me their store's loyalty card, to which I resisted because I always forget to use those darn things, plus I never had time to sign up. But then one day I had a few extra moments and decided to take the offer up. Signed up for the card, put it in my wallet and went on my merry way, all ready to remember to use it next time.
So I went in and get a prescription filled like 2 weeks later, got to the cashier and presented my card, and the girl was like "Oh sorry you can't use the club card for prescriptions"
Oh......okay....well that is kinda pointless.
So then a few weeks later I was in the same shopping centre and remembered I needed some more multivitamins. So I went to the chemist, got to the cashier, presented my loyalty card and the girl said "Oh sorry, you can't use the club card for health food supplements"
...sorry, what??
It turns out you can't use the loyalty card for prescriptions, health food products, or any sale items.
What the fuck CAN I use it for then?! I may as well throw the damn thing out :D