Hey, it's not always the other player that causes the injury. With so many projectiles hurling about, so many jumps and twists and acrobatic dives, so much nervous energy and adrenaline coursing through bodies, a sports arena can be as disorienting as a fog-smothered battlefield.
And players take friendly fire. Not only from teammates, but also from themselves.
Click on to see 10 players who gave themselves a royal beaning.
Poor Serena clobbered herself in the mouth as she went after a lob against Garbiñe Muguruza in the Australian Open last week.
You know how when kids first learn sports they are resistant to follow-throughs? This is why.
Bicycle kicks. One of the most amazing, acrobatic, crowd-pleasing moves in soccer. Nail one for a goal and you're a hero.
But there are risks, as Chelsea's Yossi Benayoun found out in this July 2011 game against Kitchee.
We've all felt that pre-competition adrenaline rush. Some of us drop and do push-ups. Some of us run in place. Some of us let out our best barbaric yawps.
And then there's Owen Schmitt.
If you are only going to put two points on the board during a game, well, better make that a spectacular basket.
Which Shelden did.
Though not a professional golfer, this Oregon teenager made news for his wild swing. The sordid tale goes something like this:
It was a dark and rainy day. Young Alex and his pals decide to hit some balls on the practice range. Alex teed up. Swung. The ball nailed a metal pole of the awning and ricocheted back into his eye.
He is suing the golf course for $3 million.
The world giggled.
In a May 12, 2012 game against the Reds, Nationals outfielder Bryce Harper wielded his bat gangland style and took out poor-performance fury on an innocent wall. Not to be victimized, the wall fought back.
Harper needed 10 stitches (and probably an anger management class, an image consultant and ear plugs to block out the upcoming deluge of taunts.)
Chiliean player Brian Carrasco apparently really, really, really wanted Chile to qualify for the U-20 World Cup.
With Chile down by one in this, the final qualifying game, and time running out, he got creative.
Hey, people always say don't wait for opportunities, make them.
Knowing your own strengths and weaknesses is an important part of excelling in sports. Maybe some day in the future, virtual reality training programs will allow a pitcher to experience being at bat against himself. Or a quarterback to try and catch one of his own long bombs.
A lot could be learned. Techniques improved. Accuracy enhanced.
So let's just call Tyson Fury a man ahead of his time.
In a 2000 CFL game, quarterback Kerwin Bell fakes a hand off, then easily saunters into the end zone for a touchdown.
He wants to celebrate, but has to be sure he executes his spike where he can get a little heh-heh-in-your-face-sucka value out of it.
He was penalized. Both by karma and the refs.