I'm sorry, I'm not saying this has happened but, on aircraft I've worked on, loss of panels, doors, cowlings can generally be divided into "darn, need a new panel" and "Jeez, this could take another big lump of the aircraft with it". In the latter category in my experience are Puma transmission deck cowlings, King Air upper engine cowlings, Navajo/Chieftain nose baggage doors, and I would include any crew door.
A Cessna 150/152/172 door is secured in flight at 3 points; 2 hinges and the latch. It is being suggested that one of these can be released and the other 2 put under stress outside their design certification.
Again, I'm not saying its a thing but, you know, be my guest.