I found $20 once on the W&OD Bike Path. Someone must have reached into their back pocket, pulled out a snack and the $20 fell to the ground.
The cutest find, though, was a snapping turtle the size of a dime. I saw something very small and round moving as fast as it could along the bike trail pavement. I pulled over and it was the tiniest snapping turtle ever. He/She was working so hard to cross. I had to help him/her before someone ran it over.