Stealing charity collection tins
I was at the mall the other day and there were some people singing Christmas carols with a collection tin for a cancer charity. It was really busy and no one was looking so I just picked up the tin and walked away. There was $44 in it.
Because it was so easy the first time, I did it twice more over the course of 2 days. I made over $100 and no one noticed me or tried to stop me.