I always had a real problem with this.

My father is a commercial properties land lord, he used to have a bunch of buildings in NJ and California. So, when I was a kid I was always going with him to check out buildings he was going to buy and fix up, or help him clean up buildings tenants moved out of. We always would find a ton of good stuff. It's amazing what people leave behind, either because they didn't care about it or didn't have the room to take it.

To give you an idea, we've got boxes of candles, a Wurlitzer jukebox loaded with 45's, an old generator (belt drive), bullets, engines, lawn mowers, even entire vehicles (a beat up F150 pickup and E-series van). Our shop is still full of stuff we've found. If it's good or we can fix it, we keep it, if not it gets sold for scrap.

Because of that, I hang onto darn near everything that has some sort of sentimental value or scrap value. I've got at least 15 of those big plastic containers full of crap down the basement. It's come in handy quite a few times, but it's getting to that point where I'm going to have to go through it and bring the dumptruck home to get rid of whatever isn't worth saving.