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 I once genuinely pitched the use of pneumatic tubes to sell icecreams in supermarkets to a major multinational company. We built a prototype and everything.