I had a co-worker and good friend who wrote his own OS for small micro-controllers, long before Arduino or Raspberry Pie, or even system-on-a-chip.
He called it Directly Integrated Layered Device Operating System, or DILDOS for short. I think the whole reason he worked in embedded was just so all his projects could feature a startup scroll that read “Booting DILDOS…” during product review meetings.
