When Valve released the Source Filmmaker code earlier this year, it was accomplishing two things.

1) Put an amazingly flexible set of tools in the hands of amateur filmmakers, who could go on to produce some amazingly professional results.

2) The most professional of those videos could serve as the very best kind of free advertising any company could hope for.

Nothing exemplifies that better than this Left 4 Dead 2 clip by Zachariah Scott called Midnight Power, which is just about the best thing I've seen all week.

MIDNIGHT POWER [YouTube]