A simple ethical conundrum

I found this post on Marginal Revolution, and I thought it was awesome. Figured I'd share with you guys:

A few days ago I was in a London taxicab when I noticed a possibly expensive purse in the seat next to me. I climbed out of the cab and without much thought (shame on me) gave it to the driver. I explained someone had left it there. Of course I was intent on treating the driver like a decent human being. But wait, I know I am honest and maybe he isn't. But wait, maybe I couldn't have gotten the purse to the woman very easily. But wait, I could have posted notice on this blog and had you help me track her down. But wait, isn't it my obligation to simply leave the woman no worse off than she was in the first place? But wait, what is the default point for defining "in the first place"? But wait, what would the driver have thought if he saw me taking the purse out of his cab? But wait, isn't a purse really really important? But wait, what if the purse belonged to the driver?