I don't often get to thrift stores, but I've seen folks thrift on YouTube. One of the downright funniest (and possibly most "what were they thinking?") items I've seen found at a thrift store was a bag of rusty nails, complete with a hearty amount of rusty dust included in the bag.

Nothing like going out and brining home a DIY Tetanus Kit. Too bad the tetanus shots are not included.