Two other incidents from years ago, apologies if my memories aren’t spot on!
Whilst going through the Lightning OCU at Colt, a Canberra landed with a big hole behind the cockpit, ejection seat gun tube sticking out of said hole. The story was it was a student crew carrying out slow speed/stalling practice. During this they entered cloud, nav not too happy so departed.
A TWU Hawk (Brawdy I think) was doing some sort of affil off the east coast with I believe a fighter controller in the back (W**** P******?). Without warning, rear seater departed, after some persuasion, he did admit he might have been fiddling with the seat handle.