Reese Witherspoon [1] faced one of her biggest fears during an appearance on Neil Patrick Harris [2]'s new live variety show, Best Time Ever, on Tuesday. The actress, who was the first celebrity guest announcer on the show, took things to a whole new level when she was tricked into competing against Neil in a high-wire challenge [3]. After climbing a 15-story-high contraption, Reese admitted to Neil that she's afraid of heights. "Neil, I am going to bury you," she hilariously said. But the two pushed through their fears and climbed all the way to the top before zip-lining back down. Watch the cute clip above to see who wins, and then check out Reese's cutest family snaps [4].