I have real issues with background noise. I can be in my house watching TV but my ears for some reason prefer to concentrate on any noise it can thats in the background.
I find it really frustrating, especially when you ask everyone else "Can you hear that?" because its actually stopping me enjoying the film and they will all go "Hear what?"
Same in the cinema, could be watching the loudest scene ever but my ears zone in on the person 15 rows behind that is opening a sweet wrapper.