Re. the Hunter fitter incident and the ability of people to fit into/through impossibly small areas - yes it can happen.
Back in the 50's, a Hastings crashed at an 'up-country' strip in Aden. It caught fire and, with fuel tanks containing AvGas, was a good place not to be! The co-pilot was a gentleman of rather substantial girth and, despite this and a broken ankle, left the aircraft via the DV window. For the significance of this, one needs to find a Hastings and check the measurements of said DV window ......... quite impossible!!