Over the years...

All kinds of tools, some small enough to pocket, others not. Two large chain saws, once; I was holding one in my hands and doubtless looking a little perplexed when a pickup truck pulled up next to me.
"Is that yours?" Driver asks.
"Nope," sez I. "You want it?"
"Sure, but don't you?" Driver asks.
"No, I just use hand tools. Want me to put it in the back?"
"Sure, thanks!"
"Hold on, there's another one!"
He drove off with two chain saws in the back of his truck. I got nothing but this story.

I've also found $200, $50, $5, $3, whole wallets, individual cards, etc. Where ID was present, the owners for it all back; the isolated cash was mine.

Sunglasses. Cycling gloves. An SR cotterless crank dust cap. A 700c wheel, mavic open pro rim with Sturmey Archer three speed coaster brake hub (yeah, I know, right?), and a very nice Douglas fir door exactly the size I needed for the bathroom of the house I was restoring at the time (had to get the car and go back for that one). It was all by itself in the woods, by a creek, might have been there a few years... very strange.

I could go on. There's a lot of stuff at the side of the road.