Dak Man,
Sorry mate, I've watched many, silly in my opinion, "shaky boats" people jump out of my perfectly serviceable aircraft, but doubt I would ever have the temerity to claim to be one. Shaky - maybe, especially these days, boats - not as long as there's an alternative. Or are you referring to the, "Im just going to check something on the roof of the aircraft, don't let the loadie put the hatch back in"?
Smudge (ex Airman, not Royal Marine)