Tim Schafer and members of the Psychonauts development team sit down with speed-runner Stephen "SMK" Kiazyk to watch him do a run of the game and witness the different ways he's found around their painstakingly crafted work in order to complete it as fast as possible.
It's great fun to watch the development team repeatedly surprised by Kiazyk's tricks, including an animation effect that's abused to make Raz fly.
This is the season 1 finale of the Double Fine Productions series "Devs Play", the full season of which can be found at this link.