As a Canadian, I was very surprised when I did a coop term in 1997 in Mississippi, at how grocery stores had discount cards. We didn't have them up here at the time.

Because it was only a 5% discount, and I didn't buy much as a starving student anyway, I only used it for certain, specific items, just to mess with their database. So if you mined my data, I appeared to be some guy who ate nothing, drank nothing but milk, and was an inordinately prodigious consumer of toilet paper.

We have them up here in Canuckistan, now, too.