A generation of list makers?

My post the other got me to thinking about how somewhere along the line, we've been told that the funniest ways to create humor are through a) listmaking and b) randomness. Just peruse Craigslist' "best of", or McSweeneys, or all humorous films that go beyond the scatological. A basic tenet of all humor is that it should somehow involve the unexpected: thus, create certain expectations in viewers/readers, and then fuck with them. Or, use repetition. Or, be really irreverent/offensive. I will have to look into this, this "humor"...