Via Selectparks: Thuyen Nguyen's "An Unfair War," a short anti-war film made with The Sims 2, can be downloaded from Archive.org. An unusually mature example of machinima. You can also watch it via Youtube below, though I recommend downloading it instead. That YouTube logo in the corner is just so damn distracting.
See also: Nguyen's blog at Devinquest.com.