Yeah, last time I went to Canada with my boss, he bought a tank of gas with his card, and then when we went to Wendy's his card had been cut off. He was on the phone for an hour trying to tell them that yes he was really in Canada himself.

I went on ask Metafilter, and apparently it's the pattern they're looking for, a tiny purchase and then a large one. And that tiny purchase is often from iTunes.