Every actor dreams of his first major role, and for Armie Hammer it was dually satisfying, as he played not one but two parts in his breakout film, The Social Network.
As the popularity of Facebook skyrocketed around the globe, a book was published on the conception and growth of the social networking site in 2009 and a film based on it was released a year later.
Hammer, who had been floating around on various television projects for the bulk of his acting career, landed roles as twins Cameron and Tyler Winklevoss, partial creators of Facebook.
The then-23-year-old actor was tasked with not only bringing his best acting for his breakout film, but duplicating it for a separate character.
"It was weird and it was tough initially, especially the first couple days trying to figure out how we're going to do this, creating a system and all that," Hammer details to then-correspondent for ET and current omg!Insider co-host Kevin Frazier.
"But then, like anything else on a great set with a great director, we found our rhythm and...were able to truck through it, and it became just an amazing process."
Hammer then goes on to describe the logistics of playing two different characters and reveals that he would sometimes copy the acting of the stand-in for the twin he wasn't playing.
All four Winklevosses—Hammer and the real twins—were introduced after production ceased, which proved a bizarre experience not only for him but for the twins as well.
"[It was] surreal because I felt like the smaller triplet. It was so strange," he says. "...It was after production when we'd met 'em, so I'd spent the last eight months trying to think like these guys."
"...So to finally see them I was like, 'Dude, Cam, remember when you were 15 and you fell in the water?' and Ty, 'Your mom was like "Oh, I'm so mad at you guys!"' and they're like 'We just met you. You are freaking us out, dude. Pump the brakes!"
Despite his encyclopedic knowledge of their lives, the Los Angeles native, who took the risk of forgoing an education in order to pursue his acting career, says he doesn't relate too much to his characters in the film.
Watch the full flashback to hear Hammer talk about the social network itself, Facebook.
Hammer's latest major feature film, The Lone Ranger, in which he plays the titular character, is set for release July 3.