I have one to share (plenty more where this came from) ..
At one of the hants I worked at , we had a "lycra tunnel" where actors would push thru/into the lycra and come really close to the patrons. Nice effect for scaring .. bad effect if some one happened to push back..
Mind you this "tunnel" was about 3/4 of the way thru the haunt
One time, someone was already "spooked" from the rest of the haunt, and the actor pushed thru/into the lycra to scare the patron, and the patron punched back, almost hit the actor square in the nose, ALMOST broke the actors nose.
Needless to say, after that we instructed the actors to use a "wig head" to push agaist the lycra to scare the patrons, rather than thier own face.
Justr my bit of a "horror story"