Watch the top 10 viral videos of 2009 courtesy of Youtube.com. The entries include MysteryGuitarMan – Guitar Impossible, Bizkit The Sleepwalking Dog, Fred: One Million Subscribers, The Mighty Boxxy Meme, The Guild’s Alluring Avatar, The Serious Side of Shane, United Breaks Guitars, Wii Fail is a Big Win, Miley’s Twitter Moment and Keyboard Cat Remembered. Which one is your favorite?