Well, parking gate card for the pay garage I park at for work. (I have completed my educational process some time ago...) It has a mag stripe and looks like a credit card from the back, but the front is blank. I doubt they would be able to figure out what it went to. When I reported it stolen, I think they deleted it from their system so it won't work anymore.

I have rather strange taste in music too, so I doubt they will find any of my CD's to be of much use either...