Once upon a time, in an S76 galaxy far far away, I had a collective to yaw lockup. After doing a run on landing and coming to a stop, I had bottomed the collective with the requisite full right pedal. Being extremely happy to be on the ground, and not wanting to fly anymore that day, I reached up and jerked the engine levers back to idle. Well, the nose whipped to the right, I instinctively pushed left pedal, up came the collective, and the S76 popped into the air and did its own hovering auto. It's never over, till it's over.