I heard a tale about this
in which one of the participants was so pumped up on fear and adrenaline that when an Alien suddenly appeared the gut went beserk and started beating seven shades of shit out of the poor bastard in the suit and had to be dragged off him.
( Davros' Granddad a voice of calm reason in a world of spastics., Tue 10 Apr 2012, 20:51, Reply)