Look, baseball's just a tricky sport. Sometimes the ball doesn't hop the way one would expect, and sometimes there's a small hole in the grass. And sometimes Torii Hunter just slams into a wall. We can make excuses, but we'd rather just laugh for a long while.
The context: Hunter was chasing a ball down the right-field line. The result: Hunter tried to slow down and slammed face-first into the wall. The GIF: Oh, you bet it's a classic.
That's one for the all-time classic blooper reel.