At this point, I'm not even going to bother trying to go on there anymore.
Error pages are a point where something bad happened, so the user is already in a bad mood. A shitty joke just makes the situation worse.
The only time I can remember enjoying novelty error messages is for 404 not found pages. It's usually stuff like the Google T-Rex thing, or I've seen an astronaut floating in space, stuff like that.