Notice: Mature 17+ content. Here is another game cinematic. This one for the game Left4Dead. This post stems from a comment by 2nd year animator Mitch in the "Meet the Spy" post, which has generated a lot of discussion.
There is quite a discussion about motion capture and what is animation in the comments.
Mitch: "Not sure how this was animated, but the introduction to the game Left 4 Dead ... was very entertaining for me. Now it is owned by the same company that own TF2 so it might quite possibly be the same animation team... For those who don't like zombies and the such don't go to this link."