Reminds me of the time when my wife cleaned the garage, so when I got home, I'm looking through the trash can, just in case. There I see the special tools that go with my radial arm saw. They had been laying right on the saw table. So I'm all, "What the hell are these doing in here?" And she's like, "Well, they looked a little rusty, so I thought you never used them."
So now we have a rule: If it's mine, and/or you don't know what it is, don't throw it away. So far, I've only had to reiterate it about a half-dozen times but, hey, not bad for 23 years of marriage, eh?