Youtubeより転載。あまりにすごいので。768x432に縮小してあります。
[追記]転載元Youtubeページに追記があります。Valveの人と接触したみたいです。
http://www.youtube.com/watch?v=q1UPMEmCqZo

Directed by The Purchase Brothers.

The Escape From City 17 short film series is an adaptation based on the Half Life computer game saga by Valve Corporation. Originally envisioned as a project to test out numerous post production techniques, as well as a spec commercial, it ballooned into a multi part series. Filmed guerilla style with no money, no time, no crew, no script, the first two episodes were made from beginning to end on a budget of $500.

www.purchasebrothers.com