A big wreck in the u-turn involved were Jamie McMurray, Brian Vickers, Dale Earnhardt Jr., & Greg Biffle when Tony Stewart plowed into the 83 car. Brian Vickers later got his payback, and flat out wrecked Tony Stewart sending the 14 backwards into the tire barrier.

http://i.cdn.turner.com/nascar/.element/swf/2.2/sect/video/nascar_embed.swf?context=nascar_viral&videoId=cup/2011/06/26/cup-son-high-four.nascar