A Marlin lever action carbine in .30-30. My bother and I owned it together. He was never "into" shooting as much as I was and wasn't especially good at it. One fine day he sold the Marlin for a fraction of what it was worth, without asking me. To add insult to injury, he never gave me my half of the money. In fact, he didn't even tell me he had sold it until the day I couldn't find it and asked him if he knew where it was.
"Oh, yeah ... I sold it."