What is wrong with people here? They lack any sense of humor. Besides, this guy is making money selling ads. I'm surprised there wasn't a solicitation for a book. Oh wait.
I don't mind if people don't want to upvote a joke. That is fine by me. But, we don't need to downvote them either.
I disagree with jokes being the catalyst which will change HN into Reddit or Digg. I don't think it is the comments that turn the worm, rather the quality of the bookmarks which are submitted. If the heart is true, the body will be also.