? , you know, it's Friday. Yeah. We're all. Happy Friday, everybody. Now to the strange story of an American tourist locked inside one of London's largest bookstores. His attempts to get out going... See More
? , you know, it's Friday. Yeah. We're all. Happy Friday, everybody. Now to the strange story of an American tourist locked inside one of London's largest bookstores. His attempts to get out going viral. T.j. Holmes has the social square. And anyone reluctant to sign up and use Twitter, see this story. It's proof that Twitter literally shall set you free. Hey! Help me! Reporter: It wasn't an American wereful in London, but an American tourist. It looks like I'm locked in, but it didn't happen. Reporter: It did. 30-year-old daifvid was on vacation from Dallas. He went inside to use the wi-fi. Went upstiers browse, downstairs to leaf -- All the doors were locked. Reporter: When he tries to get out, trapped. People walking by on the street. Reporter: Captured in the cell phone video. That's the front door. Can't get out. Reporter: One last resort. I started tweeting. Reporter: His message, hi, waterstones, I've been locked inside your tra fall gar square bookstore for two hours. And users retweeted 9,000 times. Some offering assistance, others, book recommendations. I was too scared to touch anything. I didn't want them to think I hid in the story. Reporter: Twitter did the trick. Police and the store manager arrived, freeing Willis after two and a half hours. It was a mistake. I'll come back, but not close to closing time. Reporter: What did he do after he finally got out? Sent another tweet. And it was a simple one with two little words, it said, I'm free. A lot of people re-tweeted that. And got me and you to thinking, maybe the viewers as well. What store would you want to be trapped? A cupcake store. The cupcake emporium. Popeyes. How about you, T.J.? Oh,the liquor store, no doubt. We knew we liked you.
This transcript has been automatically generated and may not be 100% accurate.