I disagree. I regularly downvote comments whose purpose is largely for humour. Not because they aren't funny/witty/clever, but because this is Hacker News, not Reddit. Let's keep it that way.
However, I did enjoy this limited foray into humor, and appreciate that we can seemingly keep it limited to a couple funny comments, and still have intelligent conversation.
Agree, and it is interesting because offline, humor has a way of aiding conversations.