Th only sport I've ever heard of it happening in is hockey, when non goalies take a slap shot to the center of the chest. It's all because of that rubber puck flying at ~100 mph, and the last time I can remember it happening was about twenty years ago. Baseball could theoretically have it happen on a pitch, but even a bunter isn't facing directly at the pitcher.

It's also worth mentioning that since it messes with the electrical impulses, it's like a light switch. Meaning you almost instantly hit the ground, instead of talking shit for a couple seconds before walking away, standing up and then going out.