How Exactly Does This Happen? Jerry Hairston Throws Ball Backwards, Into Stands

Few things are as frustrating as making an error in a baseball game, but when it happens like this, well, that's rock bottom.

Dodgers outfielder Jerry Hairston loses control of the ball while trying to transfer it to this throwing hand, and into the stands it goes.  How a major league player can mess up something like that is beyond me, but it makes for a good blooper.