Hitchhiker’s Guide is so entrenched in nerd culture I’m always a little surprised when I reference it outside of my regular circles & people don’t get it. Python’s Holy Grail is another one. The older these things get the fewer people know of them though. Time gets to everything eventually. Apart from the digital watch thing Hitchhiker’s is pretty timeless. Most of it isn’t bound to a super specific time period. Holy Grail is much more timeless since it’s a send up of much older stuff. It’s still weird to think of them fading from popular culture though.