I'm a long time reader of Fred Wilson's blog AVC.  Usually he writes about topics relevant to his venture capital business, but he doesn't hesitate to mix in posts about his personal life as well.  Today he wrote that it's his 49th birthday and how he's beginning to see himself not so much as the 20-something with a chip on his shoulder any more.  I read his piece in my Google Reader and it cracked me up when I saw the ad that Google served up with it:

I don't think Fred's feeling quite that mature.