i would imagine now they would use night visin camera etc to watch you and you don't know so you aren't concious about if you should laugh, scream, jump etc at different parts of the film. I would find some numpty watching me with binoculars really off-putting
It was only a couple of years ago and they were using night vision goggle/binocular things. Not sure really what they were. It was the first screening about a month before it came out in the cinema so I suppose they were being ultra careful. It was a bit off putting!