Two places, I can think of: 1. Once, at a convenience store, like a 7/11, I was paying for a slurpee or something, looked down after handing the clerk my money, and saw a wad of cash lying on top of the magazines in front of the counter, and picked them up as if I had dropped them. It was about $44. 2. This morning, riding down a very wet street very early in the morning. Someone the night before (apparently) had dropped $12 on the street, wrapped up with some receipt, on a downtown street full of retail shops. A homeless guy half a block down eyed me as I circled around on my bike and picked it up. I gave it away. 3. (EDIT) I just recalled a third instance from a couple months ago. As I was waiting behind a lady at an ATM, she dropped a crisp $20 bill on the ground from the wad she had just withdrawn, and started walking away. I had to tell her she dropped one. The look on her face when I told her what she had done was worth the cost of it to me.