CC - Remind me of a story many, many years ago (not sure of veracity) chap flying a Dragon, no pax, and door came ajar. Nicely trimmed out, no such thing as auto pilot in those days, and strolled to the rear to fix said door. C of G moves, aircraft rears up pinning him against the rear bulkhead. Aircraft stalls, adopts the required nose down as required by certification where upon pilot finds himself hurled from the rear bulkhead to the forward. C of G thus restored aircraft regains trim speed and relieved pilot is able to reclaim his throne at leasure.