The Greatest Short Viral Videos of All Time

Whenever someone sends you a link to a video, if you're at work, it's almost like defusing a bomb. The longer it takes, the guiltier you feel. So, all in one place, here are the greatest, short (as in, only around 20 or so seconds in length) viral videos/YouTube sensations in internet history. From 2005 to today. Most of these are classics. All of them are awesome.