The Insider.com

If the idea of Ben Affleck on a Bravo reality competition series seems strange, then clearly you weren't a fan of Celebrity Poker Showdown. It was a tournament-style show that aired on the network in 2004 and featured Ben playing Texas Hold 'Em alongside fellow A-Listers like Chevy Chase, Angela Bassett, Neil Patrick Harris, Don Cheadle, Carrie Fisher, Chris Meloni, Rosario Dawson, Matthew Perry, Will Arnett and Lauren Graham.

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It was the first time Hollywood revealed just how passionate they were about the game and a watershed moment for poker's popularity, elevating games and tournaments to ESPN-worthy events.

Now, Ben's BFF is one of the stars speaking out in the new documentary, All In: The Poker Movie. It tells the story of how poker went from the underground to the main stage and features interviews with the sport's most high-profile players.

Check out an exclusive sneak peek of Matt Damon explaining his love of the game above and then click here to find out how you can go make your local theater go All In!