How Matthew Gray Gubler Dislocated his Knee

This is just a video of Matthew Gray Gubler and Co. from 500 Days of Summer. Obviously, it does not belong to me because the guys uploaded this. It was all out of order and it got me confused when I watched it, so I edited it in the right order for your enjoyment. Poor Gube, he looked like he was having so much fun until he shattered his knee! :( Thanks, guys, for making such an awesome video! :D