4 Pals Turn Lifelong Pranking Obsession Into Cult TV Series

"Impractical Jokers" features a quartet of pranksters who honed their skills pulling jokes on each other since high school.
2:08 | 09/03/15

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Transcript for 4 Pals Turn Lifelong Pranking Obsession Into Cult TV Series
Reporter: A force began to awaken starting in Sydney, Australia, last night. You could build pals still having fun together heading into their 100th TV show with their wackiest stunt yet. ABC's Rebecca Jarvis has their story. Welcome to the bathroom of horrors. Reporter: Four lifelong friends. The judge of the talent show. To be more precise it's a children's talent show. Reporter: Doing whatever it takes to embarrass each other. That was goo. Not great. That was -- that was good, not great. Reporter: It's a hit show on TRUTV called "Impractical jokers." And if one refuses a challenge -- Hey, cool, guy, why don't you take those shades off? That's not happening. Reporter: Be prepared for punishment. Geronimo! Reporter: How did you come up with this idea. We were pranking each other and doing it all our lives so wanted to put that forward and put that for America to see. Reporter: The show has a cult following with millions of fans across the world. We caught up with three of the stars before their craziest stunt yet. Tonight on live TV walking across a tightrope 60 feet high to celebrate their 100th show. We wanted to do something together and big and then we add the charity angle so be killing ourselves for a good reason. Reporter: We got a sneak peek into their practice. How about that at 60 feet. Reporter: Clearly taking this seriously. What do you have underneath. We just ordered a net off Ebay. We hope it gets here on time. Amazon prime. Reporter: You'll know whether or not it got here or not. Reporter: These high school friends living their dream. What's your number one piece of advice. Don't give up. We've been doing this for years except if you're not funny, give up, stop. Reporter: For "Good morning America," Rebecca Jarvis, ABC news. The 100th episode of "Impractical jokers" airs tonight on TRUTV. Outside to ginger with her "Ask

This transcript has been automatically generated and may not be 100% accurate.

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