this is mental tennis player Mikhael Youzhny takes out his frustrations on himself by smashing himself over the head repeatedly with his racquet drawing bloodflow. http://www.news.com.au/technology/story/0,25642,23483348-5014108,00.html
for those not wanting to click the link (too lazy) <object width="425" height="355"><param name="movie" value="http://www.youtube.com/v/0AEfCQxVmxM&hl=en"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/0AEfCQxVmxM&hl=en" type="application/x-shockwave-flash" wmode="transparent" width="425" height="355"></embed></object>