In the movie "Attack of the Killer Tomatoe", near the begining of the movie, there is a real helicopter crash in an open field. As the heli is landing, it is quite obvious the tail rotor strikes the ground, rendering the heli uncontrolable. It rotates rapidly about 3 times before finally touching down and rolling over. The other actors in the scene (policemen) look back over their shoulder with a look like "what the hell was that!" Don't know if the two people in the heli were killed, but almost certainly they were injured, judging by the violence of the crash. The producers worked the crash into the movie by having one of the investigators say something to the effect "Wow, did you see that! The tomato just flung itself into the helicopter!"