In 2014, a military pilot in the UK got his Nikon D5300 jammed in the controls, causing the plane to take a quick 4400' dive. He was court marshalled, and now there are ten lawsuits filed against the Ministry of Defence.
Google - Plane plunged 4400 feet after pilot's camera became wedged against controls
What actually happened was the pilot, alone in the cockpit, taking pictures. (The co-pilot was in the galley)
Once finished snapping, he placed the camera on his seat armrest.
Re-adjusting his seat (electrically) to continue his flying duties, the camera was pushed forward, now wedged between the armrest and the side-stick, pitching the aircraft hard nose down. The co-pilot managed to re enter the cockpit, but was pinned to the ceiling due to -ve G. The plane recovered from the dive due to the sophisticated software onboard the Airbus 330 - not input from the pilots...
This article in Flight Global gives more detail.....