A random question: My place was built with all the plumbing for a central-vac system that I have no intention of using ever. What alternative uses might I have, for this idle series of tubes? Right answers, speculative answers and hilariously wrong answers equally welcome.
@mhoye hunter-seeker drones to kill the son of a troublesome duke
@Jetengineweasel I love it when there's clearly a reference in play that I don't understand. Weirdly specific, but... what could it mean?
Duke (T&F)

That would never suit His Grace!Duke's catchphraseDuke, named after the Duke of Sodor, is an orange-brown narrow gauge saddle tank-tender engine who lives on the Island of Sodor and works on the Skarloey Railway. He originally worked on the Mid Sodor Railway until it closed down, and is widely respected and considered a hero amongst all the engines[4]. Duke is the oldest and most experienced of all the narrow gauge engines. He lived on the Mid Sodor Railway with several engines including...

Thomas the Tank Engine Wiki