Jamie
Till the roof comes off, till the lights go out...
Depends. If I actually saw them drop the money I'd give it back, but if I found it on the ground and had no reasonable way of knowing who it is, I'm not going to go searching for it. It's not like it's their wallet with their credit cards and ID and stuff. $50 is easily replaceable and really difficult for them to prove it's "their" $50. But if I /knew/ or even was pretty sure it was theirs, I'd give it back.