About thirty five years ago a fixed wing instructor I was training with was asked to fly a man plus his two children in a Cessna 172. Once airborne the man became very agitated and asked to fly to a certain area so his wife could see them. It turned out it was a pre-meditated suicide plot by the man. He had split from his wife and tried to use the aircraft to kill them all in front of her by forcing the CC forward.
After a couple of near vertical dives the instructor laid the bloke out by clonking him across the forehead with the fire extinguisher; all very traumatic, especially in front of his kids.