When we were kids I went to see Ghostbusters with my older brother in one of the local cinema's (The Regal).
All well and good there.
I then went to see it again with my friend Mark. Knowing full well what was going to happen when the Ghostbusters were sneaking up on the ghost in the library I yelled "RAAAAAAAGGGGGGHHHHH!!!" in Mark's ear at the point where she turned round to frighten them. He jumped out of his seat letting out the second most girly scream I have ever heard in my life.
Mark clearly did not learn his lesson about going to the cinema with me as I was able to repeat this when we went to see Jaws 4 together.
BAHAHAHAHAHA!
I had a related experience with Ghostbusters. My uncle took me to see it with my brother, who was probably 7 or 8 at the time. When the ghost appeared in the library, my brother shrieked and had a bit of a meltdown. Uncle had to take him out of the cinema, and I watched the rest of Ghostbusters alone! Thank you for sparking that memory.