The Wallet Test

100 wallets were dropped in front of hidden cameras to see
who would return the wallets and who would steal them...

From the FAQ:

Q: Aren't you invading people's privacy?
A: No. All filming was done in public places. If people don't want to be filmed doing dishonest or stupid things, then they should not do dishonest or stupid things in public.

(via Growabrain.)