Another movie-going pet peeve, inspired by seeing “Crazy Heart” tonight:
There was a skinny line that scaled the height of the screen, and it was incredibly distracting and annoying.
I don’t know if it was on the film or the projector. Heck, I don’t even know if you understand what I’m talking about. Do I make sense?
Marshall and the Movies 
It’s a scratch on the actual film going through the projector. And I get wickedly distracted by such things as well!