On nearly every ride in the urban/tourist part of town: Coins. Sometimes just a penny. Once about 40 pennies. Nickles, dimes, quarters - at least once for each.

A few years ago in suburbia: A nearly full box of unopened packages of contractor type orange foam ear plugs. I spent about 10 minutes picking them all up. I wasn't sure how I'd get them home - until I found the box they came from.

A few years ago in a rural area: A lovely bright red wide brimmed woman's hat - in middle of the road, not yet run over. I stopped and wondered what to do with the hat for a while. In the end, I tied it to a nearby fence post. When I rode by a day or two later, the hat was gone.

A week ago in the tourist zone: A Leatherman multi-tool. The saw and knife blades showed heavy use. Because I had no cargo capacity at all, I'd have had to a) leave it, but I figured I deserved this prize as much as any other passerby; b) hold it in my hand for the rest of my ride, which wasn't practical; or c) put it in the coin pocket of my biking skort, which may have resulted in a torn skort. In the end I decided to d) anonymously gift it to a friend who lived nearby.