What would you do?

I was watching this show on ABC 20/20, What Would You Do? I have seen other specials they have done like this before. They set up hidden cameras, put in actors and act out scenarios to see how people will REALLY act when put in those situations. I am always so shocked at the level of denial people are in. Maybe I'm just mean compared to most. One is a blind woman or man(actor) in a deli getting change from the employee (an actor) and he gives them the wrong bills because they are blind. I would in NO WAY stand there silently. I am shocked that it takes one person to say something before the whole room of people react. WHY WOULDN'T PEOPLE TELL HER THE BILLS WERE WRONG? I don't get it. So the question is asked.... What would you do? I have been in situations like that before. It's not always the popular thing to do, but sometimes it's just the RIGHT thing to do. I have got yelled at by a judge for putting my hands into a shoplifter's back pockets to get the merchandise he stole from the store I worked at. I have called the cops on drunk drivers when I worked at the bank. I KNOW that if I saw your husband and your best friend at a restaurant together, holding hands, I would call you and tell you where to be to watch your husband get his butt kicked BY ME!!!! Some things that are hard for people to do are not hard for me for some reason. I guess I get my "whistle blower" part of my personality from my mom. It's not always a bad thing. Anyhow, I guess it's an interesting look into human behavior. Well, interesting to me!!!