I've been lucky enough to find money three times: a 20, a 20, and a Benji. I found the 100 when I was 12 years old. I don't have a fucking clue what I spent it on, but in the fascist state of my father's household at the time, $100 was, what I came to find out later, what my mother was allowed to use to raise us with per week. So it was a windfall for me. I think I bought lunch for myself and my friends for the first time in my life.
I found a diamond ring in a parking lot once. It was outside a fairly romantic restaurant. I envisioned all sorts of horrific scenarios where someone lost this heirloom. I put up signs all over the building, left my name with the restaurant. Never got a call. I gave it two months. Then I took it to a jeweler at the mall. They ran it through the ultrasonic cleaner and put it in their conductivity meter. Yeah, Moissanite or CZ. The scenarios in my head changed tenor. I listed it on eBay and included the story of its provenance. Think I made $250 off it or something. All in all, pretty dope.