[WalterBright]

My dad taught instrument flying in fighter jets. He'd ride in the back seat, with the student in the front. The controls were linked together.

Against regulations, he carried with him a length of steel pipe. The problem was sometimes a student would freeze and hang onto the controls with all his might. The pipe was so my dad could beat him on the head until he let go, and save both their lives.

Fortunately, he was never forced to do this. But he said "I'll be damned if I let any student kill me!"

[WalterBright]

P.S. the thing about instrument flying is your senses lie to you, and you need to rely on the instruments. A green student is at risk of panicking and believing the lies his inner ear is telling him (spacial disorientation). When JFK jr crashed in the mist at sunset, my dad passed by the TV when they reported it, and said "spacial disorientation". It's killed a lot of pilots.

A major part of learning to fly instrument is to learn to ignore your body screaming at you that you're flying upside down.