Photos from We Have to Go Back to Uncover These 23 Secrets About Lost

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1. The idea for the show came from then ABC chairman Lloyd Braun's vacation to Hawaii after watching Castaway with his family and wanting to turn it into a TV show. 

"And then the notion of Survivor popped into my head," Braun told Grantland. "I don't know why. And I put it all together: What if there was a plane that crashed and a dozen people survived, and nobody knew each other. Your past was almost irrelevant. You could reinvent who you were. You had to figure out — how do you survive?"

2. Oceanic Flight 815 flew on September 22, 2004, the same day as the series premiere on ABC.

3. Michael Keaton was originally set to play Jack when the original pilot script included the shocking death of the male lead at the end. But when the plans changed and Jack was intended to remain as the lead, Keaton declined, telling The Hollywood Reporter that a steady TV gig "didn't interest me. And I know [Jack's death] was what was going to happen, and that I probably would have done."

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