One hijacking took place from Bankstown in Sydney, where the cheap-charlie hijacker only wanted to "charter" a B47 - she had earlier asked us to charter a B206 but didn't want to pay for it up front!
I was talking to the B47 pilot on the radio just as the hijacker-lady yanked his mike cord out of the socket and pointed an AK-47 (goes with a Bell 47?) at him and told him to land in the Silverwater prison. (He had actually wondered why the passenger was carrying a large shopping bag.) I wondered why he didn't finish his sentence, but he was helping a prisoner to avoid finishing his sentence.

The guards were gobsmacked, but still fired a couple of shots, hitting the frame. The machine flew for a while, but the pax realised the cars on the ground were going faster than the chopper, so they made him land on a sportsfield, tied him with the headset cords, and hijacked a passing car.
They were caught the following day, I think.
But what would I do? Hard to work out, but I would probably land in the prison and somehow accidentally shut the engine off and be unable to start it again, or maybe shut it down when a suitable field is in range and scream "AAAAAAARRRRGGGGHH THE F***** ENGINE IS ON FIRE! WE'RE ALL GONNA DIE!!!" or words to that effect.