My players stumble upon an abandoned version of one of my Dwarf Fortress cities.
I already know the whole layout backwards and forwards without needing to work with a map, and it has traps, epic architecture, purpose to every room, little random stuff scattered through, and I can usually come up with some kind of theme or ending to the dungeon for if they get that far into it. Easy peasy.
Somewhere out there is a much more sophisticated joke about spin-2 particles or how USB connectors have spin 1.5 or something, but I am not smart enough to construct that joke, and I think even on its construction the audience for it would be kinda limited.