Not much of an event compared to the above but;
As a stude on the Bell47 we were practicing AOLs with the aiming point being a metre square concrete slab set in the grass which we were expected to place between the toes of the skids when the cab stopped.
Shortly after the auto was entered and throttle retarded the stick stiffened right up and I called "hydraulic failure". The beefer knew what had happened and just said, "slab between the skids, please". Never having done an eol with no hydraulics made this an interesting few moments and the silence after stopping (straddling the slab), plus the woosh - woosh and whine from the gearbox told the story - and why after the 3Gb1 the hydraulic pump was moved from the engine to the gearbox!