You like Team Fortress 2? You like the old Teenage Mutant Ninja Turtles arcade game? Watch this.
It's Team Fortress 2 as a side-scrolling, beat-em-up arcade game. If you're wondering why the whole thing looks so awesome/authentic, that's because it's the product of Eric Ruth, who has already give us retro demakes of games like Halo and Left 4 Dead, along with the fantastical fighting game Head 2 Head.
Not only is it an actual, playable thing, but every class from the online multiplayer shooter is available, including some of their trademark moves (like the Soldier's rocket jump).
It should be available on PC by the end of the Summer. For free, of course.