I agree with this. Every so often a little humor slips through the HN downvote filter and it usually fits your supplied parameters. I'd also add (4) not ironic

I agree with this. Every so often a little humor slips through the HN downvote filter and it usually fits your supplied parameters. I'd also add (4) not ironic or sarcastic (5) not absurd. Crafting a joke that fits all that is probably worth an upvote just on principle.