[Filtered from non-puncturable characters just to be safe]
So I was watching the original Dune tonight and it occurred to me - in that movie, and I think the book although it’s been awhile since I read it, the spice is the most valuable substance in their world right? And the worms produce the spice from the sand they eat. So if you think about it - the most valuable substance in the world of Dune is - worm poop.