Clippers is a bit too far. I prefer the gag w/ the chainless chainsaw that's just a motor running in the dark, that was some scarier fucking shit as a kid and no one got a haircut.
I need to apologize to some poor guy who was working in one of those haunted houses about 30 years ago. My friends and I were going though one when out of nowhere a guy dressed like Jason steps into the light as he is pulling the cord to start his chainsaw. He put the spinning part (no chain of course) against some metal plate or something that produced sparks. As soon as I heard the girls scream, I kicked that guy. Right in the nuts. I turned around and my friends were running away (they didn't see me kick the guy, they were already turned around to start running) so I ran after them. I didn't even say sorry to that guy. So, "Jason", you'd be in your mid to late '50s now. If you worked at fairs in the mid-West in the early to mid nineties, and some blond guy who was about 130 lbs kicked you in the nuts, I am sorry. I didn't think about it, it was my fight/flight reaction, and I just did it.