Cheerleader delivers knockout blow to her own forehead

Cheerleading can be hard, physically taxing work. Aside from just holding the pompoms and trying to get the Friday night crowd up on their feet, a lot of preparation goes into making sure such moves as pyramid stands and leg kicks are fine-tuned. And, sometimes, things go horribly -- and hilariously -- wrong. This cheerleader gets way too overeager with a leg extension and ends up delivering a healthy dose of kneecap directly to her forehead. She hits the ground hard but appears to be OK. The laughter of her cheermates is probably what stings the most. Enjoy the best four seconds of your day!