reminds me of one time way back, I was working in a mall in Medford Oregon, at a Christmas wrapping thing.
I had this idea to start making false presents, and set them out, where I could watch them.
I tried to make it look like an expensive ring might be inside or something similar. You wouldn't believe how people reacted!
Some of them picked it up and stuffed it quickly under an arm or purse and off they ran out to their car.
Some would find a mall worker and report it, but most took it and looked guilty as a face can make when they made that decision to walk out with it.
I put a little not in each one telling them I saw how they reacted, and saw them leave with it. And something to the effect that they had been watched the whole time. It was hilarious, I thought. I got other people doing it too. I'd love to do something like that again.