But there's one thing you may want to know about brett cohen. He does have a big secret. And he's about to reveal it all this morning. Take a look. This is what it feels like to be famous. The... See More
But there's one thing you may want to know about brett cohen. He does have a big secret. And he's about to reveal it all this morning. Take a look. This is what it feels like to be famous. The paparazzi on your heels for the perfect shot. Everyone wants to be seen with you. Everyone knows your name. How was it like meeting brett? Oh, I love him. He's beautiful. Reporter: Never heard of brett cohen? That's okay. None of these people have. He's actually never been in a movie. Doesn't have a hit single. He's a normal 21-year-old guy, who wanted a glimpse. Nowadays, it seems like anyone can achieve fame. Why can't I do it, too? Reporter: So, he decided to see what would happen if he just looked famous. Sunglasses, entourage, and all. To pull this off, I changed my appearance to make myself look like a typical celebrity. I'll have bodyguards, assistants, and a few photographers follow me around times square. And I'll bring along a camera crew to film every second of it. We'll walk past thousands of people. They'll have no idea who I am or where I'm from. But they're all going to fall for it. Reporter: Hundreds of people suddenly thought brett was a movie star. And somehow, even remembered seeing him in a movie. I think he's excellent. I think he's awesome. I think he has a great future in the movie business. I just took a picture with him. I feel special. Where do you know him from? Spider-man. Have you heard any of his music. I heard his first single. It's good. I don't know the name of it. But I heard it on the radio. And now, without further ado, ladies and gentlemen, the one, the only, brett cohen. get over here. Get over here. How are you? So, how does it feel to be brett cohen? It feels great. The past 24 hours have been insane. It's really -- it's all come about. It's been much more different than I ever dreamed. It's such a funny experiment, video. And it just -- I love that people are enjoying it. The truth is, everybody. Brett is a 21-year-old college student. But like so many people, you wanted that 15 minutes of fame. So, what is the secret? How can we make anybody who wants just become famous for a taste? In putting it together, I put together what I thought would be needed to create that image. And people are obsessed with it. If they see someone that looks like a celebrity, if they see bodyguards, if they say assistantsking around, cameras flashing, they're going to believe it. That's exactly what we did. We made it happen. The whole thing worked perfectly. We made a really funny video. I know you're going to use this as your thesis for college. But now that you a taste of celebrity, do you want more? Are you going hollywood on me, brett? I would love to. I would love to have a show. I would love to have my own show and do things like this all the time. That would be my dream come true. Yesterday when it was all going crazy, all I wanted to do was sit in bed, watch tv and eat food. At least for today, you are our brett cohen. Thank you. The one, the only. Thank you. We're so glad you came for your first exclusive appearance on "good morning america."
This transcript has been automatically generated and may not be 100% accurate.