I haven't really had many scary moments, fortunately. Perhaps I'm just too dumb to be scared. But one night we dropped out of the clouds in a HEDA, heading for a drillship all alone way, way out. I checked the cojo, stable at 500' on a downwind, and looked down and chaged the selector switch to company flight following, called local at the ship, looked back up, and we were passing through 200', in a 900'/min descent. I grabbed the controls, leveled off, and climbed back up, and then the cojo realized what had happened. He had been trying to fly visually with absolutely no outside reference. I made a slow pattern and approach to the ship, because it took a little while to let the adrenaline levels subside.