As I shut down the airplane I turn off the avionics, bring the power back to idle and then on each engine momentarily turn both magnetos off, then back on again as soon as I have verified that the engine would die without them. That means that when the off position is selected for the magnetos, turning a propeller by hand just to move it out of the way cannot produce a spark and start the engine. Then I return the power to 1000 rpm and shut down the engine by pulling the mixture levers all the way back, cutting off the fuel supply to the engine.
Considering the number of things I have to do right to start the engine when I want it to start, it seems a little ridiculous imagining the slight movement of a propeller during ground handling, with the fuel cut off, causing the engine to start. I wonder if this is a safety precaution that made sense long ago and is no longer relevant, but that we've never stopped following. Has anyone ever heard of a ground-handling propeller strike accident that occurred because of a live magneto, when the mixtures were in idle cut-off and the mags selected off? I have met a few American pilots and mechanics who have never heard of the check, so perhaps it lingers longer in the British Empire.
On this particular occasion I not only put the airplane in the hangar, but then climbed back on board and stowed all the oxygen masks and cables, took everything out of the seat back pockets, removed snacks and garbage and chart collections and generally cleared the way for maintenance to take out the seats and rip out the floor panels for a major inspection. That also means a few days off for me. The exact number will be determined by what they find on the inspection. I go home and put my phone on the charger. For a few days I am set free from the requirement to have it always with me.
The next day I happen to be sitting near the charger and it rings, with my boss' name on the display. I answer and recognize the boss' bad news voice. I wonder what horrible thing they have found with the airplane, and if there is some way I have caused it through poor airmanship, or missed finding it on my preflight inspections. But, it's nothing to do with the airplane. One of my coworkers has been critically injured in an accident. Nothing to do with work, just out with friends. It puts everything else into context. Life is so fragile.