I received 3 downvotes for a link to XKCD suggesting that readers lack a sense of humour. No one felt like leaving a comment stating why they downvoted.
I think it suggests readers don't want HN to be a place where links to cartoons and lolcats are overvalued. Perhaps they go too far in the other direction.
If readers in general don't want that, I should really have gotten many more downvotes. 3 downvotes suggests that a few people just didn't like my comment while everyone else was indifferent.