I'll never forget this newspaper clipping; wish I saved a copy.
Some time ago, 70's or 80's an African (Ethiopean?) airliner was at cruise. The pilot came out of the cockpit followed by the copilot. Who was flying the airplane? Why, the autopilot.
They hit some turbulence and the cockpit door slams shut and locks. Fortunately, it was not the modern reinforced door and they used a crash axe, fire axe, whatever they use in Africa axe to gain cockpit entry just before entering Libyan airspace. Which would not have been pretty.
I cannot find a citation on the web but I swear I saw the newspaper clipping!
Jim