Crossfit! http://i.imgur.com/AoClAei.gif
Crossfit! http://i.imgur.com/uLWrijU.gif
Crossfit! http://i.imgur.com/s4GWEmj.gif And again! http://i.imgur.com/7gCoxY7.gif and again! http://i.imgur.com/uOXc113.gif
Crossfit! http://i.minus.com/iZUsT11hiMbCz.gif
Crossfit! http://i.imgur.com/MPSXRUT.gif
Crossfitttttt! http://i.imgur.com/Y2yrqPS.jpg
Crossfit! http://gifsoup.com/view3/4092663/crossssifttt-o.gif
Crossfit! http://i.imgur.com/gs28aPU.gif
Crossfit! http://i.imgur.com/0iQG9fx.gif
A lot of what you see in there is either officially encouraged ("kipping" = basically cheating at pullups/lifts/whatever for more reps with shit form) or arises from a total lack of proper training on anyone's part (the guy who just powers up the weight with his arms and back rather than using his legs)
Remember, Crossfit: not even once.