Several years ago, in 2008, there was a tremendous play that occurred during a game between the Kansas City Royals and the Boston Red Sox.
Jason Bay skied a ball to deep center field; Mitch Maier, the Royals center fielder at the time, went back and leapt, attempting to take a home run away from the former Ray. The ball bounded off of his glove and then, instead of continuing it’s momentum towards the other side of the fence or falling back into play, it just rolled precariously on top of the wall.
If not for the quick thinking of Royals left fielder, Ross Gload, the ball may have very well just stuck to its spot on the top of the fence, never fully committing to which side to fall.