It was one of the great pleasures in my career in the Royal Air Force to have become a friend of Nick "Taff" John (who was also known as the Prince of Darkness.)
Taff was an instructor at Dishforth teaching young men to fly the Hastings.
At the end of the course, it was usual for the instructor/examiner to sit in the right seat and examine the student captain, then swop seats while he flew with the co-pilot.
Taff had another idea. He would give the flight engineer a piece of paper with various emergencies listed (such as; "After the third touch and go, switch off the fuel on No.4.").
As already stated, the F/E sat facing backwards. Taff would sit himself upon the jump seat and watch what happened when the trainee crew acted together as a team.
One night, after the third touch and go, the F/E duly switched the fuel off on No.4. The co-pilot had a go at No.1 and the captain had a go at No.2.
As the aircraft sank towards the Vale of York in the dark, Taff apparently took his pipe out of his mouth and said "Gentlemen, would everyone put everything back EXACTLY as they found it!"
The beast burst into life and they got away with it.