Regrettably, the car jettisoning story doesn't ring true - the teaching was always not to jettison freight as it would likely take the tail off (but happy to be proved wrong please).
My favourite Pedro Tyas story is the one where on a pax flight he climbs out of the aft escape hatch telling the young squaddie not to let them shut it up. Shortly thereafter the GE (was it you Smuj?) came down and shut the hatch, despite the protestations of said squaddie. Pedro, of course, had walked along the roof and back in via the flight deck hatch. After landing, the process was reversed, followed by frenetic thumping on the aft hatch.........
I hope I've got that at least a bit right!!!
There's so many Herc stories - a good source for stories in general was tales from the Crewroom by Dave Berry!