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It finally happened.

Someone finally completed Stage 3 of the "American Ninja Warrior" course. And then it happened again.

Isaac Caldiero is a busboy, but he also happens to be one of the most famous and well-respected mountain climbers in the world. Still, watching him complete the course is nothing short of amazing for common folks like us.

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Caldiero wasn't the only one to do it, though -- Baltimore Orioles cameraman Geoff Britten did it after Caldiero, meaning the two needed to square off in an unprecedented Stage 4 challenge.

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Caldiero won by about three seconds to take home the $1 million prize.