...unless you're old or a loser or something. Well, I guess I'm both, because I have only seen a few of these!
Youshouldhaveseenthis.com is Greg Rutter's Definitive List of The 99 Things You Should Have Already Experienced on the Internet.
Can any of us forget the dancing baby?
Note: I hated #1 - don't watch it. You've been warned.