It happens on the North Sea too
Super Puma, rotors running. Avionics engineer has some business in the tail boom. Pilot, returning from pee break, closes boot and off they go.
Engineer, now in dark, manages to crawl backwards, pull baggage from top shelf and locate fire fighting hatch on the bulkhead.
Passenger, who was convinced that he was on rear seat, is very surprised to find a hand tapping him on the shouder!
TD