 During a scene where Dereks van swerves off the road and runs over  one of the aliens, Ken Hammon (qv) sat on the hood of a van  because they werent able to buy a camera mount for the hood.  Peter Jackson (I) (qv) was driving, but neither noticed a tree  stump hidden in the tall grass. The van stopped immediately from  high speed launching Ken and the camera into the air. Amazingly,  both Hammon and the camera came out fine, but said, "We aint doin  that one again!"