I once abandoned one on the side of the road. 

A few years later I remembered that, at some point, I had stashed within the car a tiny encrypted USB drive. It contained a backup of my BIP38 encrypted private keys. 😧

Thankfully I had moved the funds not too long after the car was abandoned, though I doubt anyone could have gotten past two encryption layers. 😂 

 There's a laminated sheet of addresses and BIP38-encypted private keys in the attic of an old share house near here. Addresses long swept but a time capsule for whoever stumbles on this one day. 

 A very different time