The Warcraft Mountain Dew Spec Commercial was Ian Beckman's entry into the BlizzCon 2009 machinima contest. According to Ian, he'd secretly hoped that the Mountain Dew folks would see the commercial and think "Holy crap! We love this idea! Let's make it a commercial!" That didn't happen, but the video's still pretty awesome.
It's pretty short, of course, but the style and lightheartedness of the commercial won me over. Two warriors are fighting in the war-torn fields of Azeroth. When they spot a Mountain Dew through the computer screen, they immediately launch themelves into the real world to win the soda for themselves.
The Warcraft Mountain Dew Spec Commercial is a little additionally ironic in the tableau of panels offered by BlizzCon. As Alex Zierbart pointed out, it was relatively rare for any of the Blizzard presenters to actually touch the Mountain Dews hanging out on the panel tables. Still, that doesn't impact my opinion of Ian's commercial, which was overall pretty fun to watch.