Humor: Canon 7D vs. Barbie Video Girl
This 2010 video was originally created as a little inside joke. But it quickly became viral with a few well-placed emails and tweets to the right influential blogs quickly led to it being embedded and shared around the world.
In the end, the video was embedded on dozens of top blogs (including Gizmodo, Engadget, NY Magazine) and Tweeted by WIRED, Guy Kawasaki, and Barbie herself. Apparently even Canon contacted the creator and asked permission to show Canon 7D vs. Barbie at their retail conference in the UK.