Gimme gimme four chords (and satisfaction!)
Here, have some video awesome. This is the Australian comedy group's Axis of Awesome performing "Four Chord Song." There is apparently more at
http://axisofawesome.net but I haven't looked there, yet, because I have to do stupid things like scrub green paint out of my hair before going to work.
Brief 1-second profanity near the end if you're listening at work. (Slackers!)