A few weeks ago, when I bought some games online, I got a security call as well, for my credit card usage -- since I don't use it too much. Though, that was me actually using it.

Damn me and my gaming purchases...
I also remember there was a report on Dateline a few years back, about many stores that take Credit Cards which use very weak Security programs to secure them to save money -- i.e. TJ Maxx, Best Buy, etc etc. I actually watched that episode -- and yeah, I'm not the type of guy to watch Dateline very often.