I was flying my Supercub with the doors open, good fun with a well banked right turn, nothing but air between me, my passenger, and the countryside, when the ancient A4 plain brown envelope in the rear luggage compartment ripped open, and the entire contents, being the POH looseleaf, began to rise up and try to escape! The passenger managed to collect most of it, while I was cackling in the front seat, it was so funny! We only lost 3 pages altogether, and on landing, found two pages still clinging to the bracing wires on the tail.