Protocol For finding cash on the ground....What is it?

So Ricky and I went to the movies on Friday night (Bad choice since all the weirdies and 3,000 of their brothers decided to go to the same place as us). Anyway while we were walking around the theatre for an hour waiting for our movie to start since the time we wanted was sold out..Ricky turns to me and asks me, "If you found money on the ground what would you do?" Now I saw, "How much?" Then quickly rethink and just say, "I would turn it in." Now mind you I love money and I could always use more of it so it isn't easy for me to say turn it in but I feel that it is the right thing to do. If I had lost it I would hope someone was honest enough to turn it in so that if I had realized it I could try to claim it. But anyway since Ricky asked me you know he felt so inclined to take my advice..RIGHT???...WRONG!!! And he tells me that his logic is that if it is cash and he takes it to the counter than no one will claim it and a worker behind the counter will just poicket it and the owner will not get it back anyway..or someone behind him in line will hear him turning it in and then they will claim it right after Ricky walks away. I still say that no matter what the other people do it is still our duty to do the "right" thing. So what is the "so-called" protocol in this circumstance..if it is cash keep it because no one can prove whose it is?...If it is a wallet turn it in (without rummaging through it) because you are sure whose it is an that would be stealing? What do you think?