These are the kind of things that scare me about helicopters, when they do things that they normally wouldn't do. To think that it was one of my dreams to fly a BK just because of the manuverability.
While at Bell School I was shown a video of a BO105 that was doing some sort of aerobatic routine, it was painted in primer and white and N registration, anyway during one of the low level tight turns he just kept turning until he hit and the ground and exploded into a ball of fire.