How about when you're 30 minutes in and you desperately want some more candy, so you put your hand in the plastic bag and it makes an abnormally loud rustling noise that never occurs outside of the cinema. You keep digging and digging and it gets louder and louder and you're like "oh god, I'm ruining this movie for everyone." So you look at the dude next to you and he's not looking at you so you finish up as quick as you can and you pull out the candy and eat it then lean back like "yeah man...I made it."