Is Team Fortress 2 the lord God's greatest gift to machinima? The video beneath the cut rather suggests it is. A tiny part of my brain curls up and dies when I try to guess at just how much time the chap behind this mass slaughter/domino effect experiment spent on it, but the explodey, spectacular results speak for themselves.
Oh, and anyone who says something like "well, technically this isn't machinima..." is a whiny wee wretch.
Thanks to SuperNashwan and Alan for the tip.