I was once tasked to fly the Lord Mayor of Telford in an RAF helicopter. Despite my careful safety briefing not to touch any handles in flight or after landing and to wait for me to stop the rotor and to open the door to let him disembark, immediately on landing he pulled the jettison handle on the rear door, thanked me very much for a wonderful flight then tried to get out rotors running. I had to shout “WAIT!” and thankfully he did. After I’d shut down and helped him and his entourage out he just thanked me again shook my hand and wandered off!
Meanwhile I had to get engineering authority to refit the door and fly it back to base.....not easy without a mobile phone.