It's time once again to feature the mentally challenged and/or substance-abuse-impaired knuckleheads who jump over the fence and run around on the field of play at sporting events. Today we find ourselves in lovely San Francisco as fans take in the Athletics-Giants game.
This fellow decides he's going to run out and try to climb the wall in center field. He, at least, makes it to the wall. Then tries to scamper up, flailing as he does, only to be tackled down by security—so close!—further illustrating that it is much easier to get on the field, than off it. Under your own power, anyway.
Here's another view.