Coming to times square, to the question, when kids get their hands on alcohol, latest survey shows that the source is often an adult family member. Even though under aged drinking is against the law.... See More
Coming to times square, to the question, when kids get their hands on alcohol, latest survey shows that the source is often an adult family member. Even though under aged drinking is against the law. That leads to a dilemma. What would you do if you saw an adult buying alcohol for a teenager? The legal drinking age is 21 in this country. John quinones asks that question in an episode of "what would you do?" As fathers and mothers, we try to be the cool mom or dad because we want our kids and their friends to like us. But how much is too much? What if you see that cool dad in a liquor store, stocking up for the kids' house party? We wanted to find out what people will do if they see one of these dads in action, buying alcohol for his underaged child. You're going to fit right in. We need vodka. We don't need vodka, dad. I don't want to go overboard. Grab a little soda, too. Reporter: This woman enters the store and immediately takes notice of father and son. And it doesn't take long for blanche to react. You can't buy that. That's underaged drinking. You cannot buy it. It's going to be at my house. You'll be the one arrested. You can't sell this to him. You know it's wrong. You can't sell it to him. And I'm going to stay here. All call the police. Do you have a company phone? I'll call them. Reporter: Despite that threat, our cool dad just won't give up. You never threw a party for your kids? No. Never. My oldest is 30. Never. It's the wrong message to send them. Are you kidding me? Reporter: What was going through your mind? He said he was 16. His father tried to push alcohol on him. Wrong. Reporter: The danger here? He could be arrested, he could lose his house, the father, the parents. They could have alcohol poisoning. It's wrong. Reporter: Our last customer of the day has no problems speaking up to our dad and showing his disapproval. You're kidding about letting him drink, right? You do that in new jersey? Mind your own business. You're going to let him do that? It doesn't matter. Kwlouf him? Do I look like I'm joking? This is for a kid's party? Buying booze for his kid. You think I'm joking? Reporter: You want to take a Your message to fathers who think like that? Don't do it. Don't do it. Don't buy it for your kids. Don't buy it for yourself, if you're driving a car at all. With kids around. Reporter: His argument was, might as well they learn at home. Absolutely not. Reporter: His final words about our cool dad? After you've had a drink, my hat's off to you. The face looked like it. Reporter: A good actor. Good job, man. Nice. Believe it or not, not everybody tried to stop the father. Tonight, you'll meet a woman who offered him drink suggestions. What? And also tonight, howie mandel joins us on the show for some undercover work of his own. Howie was a great sport and did two scenarios. One serious, and one hilarious. Howie is an infamous germaphobe, self-professed. All right, john. Great provocative episodes. "What would you do?" Airs at 9:00, 8:00 central, right here on abc.
This transcript has been automatically generated and may not be 100% accurate.