What would you trust from a secondhand store such as the Salvation Army?

I frequently get bored during my lunch hour, and in a desperate attempt to get out of the office for a bit I wander around the various stores/buildings across the street. Lately, I’ve been wandering around the thrift store, and sometimes I’m surprised at what they carry (for example, a wireless access point) and for how cheap ($5). Obviously they have clothes, toys, kitchen utensils, even furniture, but some of it is in a questionable state.

Do you have anything you would never buy at a thrift store, regardless of how cheap it was? What about things you’d grab with no second thought?