Here's a recent TV commercial that Microsoft commissioned for it's new Xbox 360 and then banned, ostensibly because the non-existent violence portrayed in it was deemed to be too.. violent: streaming video via youtube. (This seems to be a pattern with Microsoft - here's a link to their last banned ad for the xbox 360.)
And here's the "trophy video" which alleges to show (possibly Irish or Scottish) security contractors in Baghdad randomly shooting at motorists on the infamous highway linking Baghdad to the airport: downloadable quicktime video. Although the incident is being investigated, since the shooters in this case were private employees (of Aegis Defense, Ltd, a firm hired by the US), they're not in any legal danger, even if the people they shot were innocent civilians. The Elvis song "Mystery Train" was added later by the Aegis employees who shot the footage. The video first appeared on this Aegis employee's site, but the files have since been removed. Here's a Telegraph UK article about it.