I had a guy try one on me yesterday. I was in the parking lot of Costco and a guy comes up and puts on a convincing act and say he has a car in the parking lot across the street and needs a ride so he can get it towed home by a buddy. I offer him a ride and then he says he needs 9 to round out a 20. I said sorry, no cash and then it all stopped and he just wanted out at the next parking lot.