Those of us who should have retired by now well remember the hijacker in the States who boarded a 727 with a parachute and then demanded loads of money not to blow the a/c up. They landed, got the money, he lowered the rear stairs on departure, closed the pressure door and was never seen again, presumbaly getting away with it, though there were rumours that some of the wrappings from the money were found downstream in a river under the a/c track.
I believe they set up some kind of diner or cafe named after him somewhere under the track the a/c followed - a bit of hero-worship. Subsequent copycats that demanded parachutes and money were supplied with non-working chutes, rumour has it...
For years afterwards we were told that parachutes in the cabin were a complete no-no. Dunno, but I'd have thought that if cabin pressure = outside, then you could take out an overwing plug and get away. You don't have to up to FL300, FL50 would do just nicely, thank you. Also dunno about hitting the tail on the way out, either.
Cheers,
The Odd One