OK, I know jokes aren't appreciated on HN, but this comment is comedic art.

Jokes are ok, they just have to be unique and funny - like this one. Clever doesn't hurt either. Stupid memes or lame, tired, or mean jokes are not ok.

It's always good to have an official ruling. God forbid someone goes overboard.

Exactly! Couldn't agree more, humor is definitely one place we need strict guidelines, otherwise how we all know what's funny and acceptable and what isn't?

I'm just telling you what I've observed over the years here and dispelling the notion that it's frowned on entirely. If you want to start reddit-style memes, go ahead, have fun.