Infin1ty, I think you misunderstood what happened.
I agreed to drive the man home. From the age of 16, we drive a lot in the US, so by the age of 20 or 24, we have no problem concentrating on driving and talking at the same time.
During the ride, the man mentioned that he needed change. He didn’t tell me how much change he needed, but he asked me where I lived. Based on where I lived, he started by talking about a large amount of money, but as he heard my responses, he realized I didn’t carry so much cash around, so he gradually lowered the amount and finally settled on getting change for a $5 bill, because he thought I’d have $10 or $20 on me. After I stopped the car and parked, he began the swindle.
When he had me making change for the $5 bill, he started talking in a very friendly but confusing way. He would talk about the money, then switch to the previous night’s baseball game on TV, then to music, then to the money, and kept changing so fast that I never had time to focus on what he was saying at the moment, because he was already talking about something new.
At the same time, he had me swapping bills with him. Maybe I had given him five $1 bills, and he would say, “Okay, let me give you back the five, and you give me two more ones, and I’ll give you back 50 cents…” This was all done very fast, and interspersed with a lot of conversation about other subjects. Because he’d spoken so fast and made a simple transaction so complicated, a minute or two after he’d left my car, I realized that I had given him a total of $20 in exchange for $5.
We call this kind of swindler a “quick change artist”, and they are very good at what they do. My father was a banker and said that the bank tellers have to be trained to detect the scam and to stop as soon as things get confusing. Most people who work has cashiers in retail stores are tricked by such a person at one time or another.
One time a cashier really did make a mistake in my change, and I had to explain what she had done. My explanation was so complicated that pretty soon I realized I sounded like a quick change artist and that the lady would never give me the right change, because she thought I was swindling her. I finally just left my name with the lady and told her, “Your cash register will be out of balance at the end of the day, and when it is, you’ll know it’s my $10.”