I used to go to the local dollar store and grab myself a can of coke and some lollies (candy) on my way to the theater. In England, right before the movie starts, they have the rating card come up for a few seconds. It's always the most quiet time because the movie is about to start, so no one is taking, there's no movie playing yet, and the ads / trailers are over. I would always open my coke at this moment of silence because it was so funny to me to be sitting in a room full or silent strangers and for the only noise to clearly be the sound of a can opening that no one could see was just a coke.