Obviously I wasn't there so I don't know what happened but I was in a Cessna 206 which had not long taken off from Dallas Fort Worth doing about 80 knots when the front passenger accidentally opened his door and panicked - door did not swing shut despite prop wash - perhaps because of high wing? passenger was more worried about losing his hat than realising he might fall out - he had either failed to properly attach his seatbelt or somehow undid it during this - it took pilot holding onto his leg with his right hand me unbuckling myself in rear seat and reaching over him to hold him in and eventually get door shut.