Didn’t this happen on an Airbus at least once? I seem to remember hearing that pilot’s iPhone got wedged behind the joystick and pushed the nose down until he could knock it loose.
It was an RAF Voyager (Airbus A-330) I think you are referring to and a DSLR camera (Nikon D5300) that became wedged as you say[0].
The item didn't get knocked loose, it was the plane automation that saved the flight. The auto-pilot self-corrected and levelled off when it detected prolonged dangerous pitch down input[1].
