I recently dished out some of that customer Sh ite myself. I rushed in to watch youth in revolt after mis-managed time and ended up just catching the last film trailer. I decided a quick dash to the toilets was needed.
5 Mins later
Come to get back in the screen and the bloke who had ripped my ticket 5 minute earlier asked for my ticket. Idiot here had left it in his jacket pocket. Explained to guy who then ranted at me about carrying it with me as it is a reciept and people like me make his job a nightmare. He then followed me to my seat and made me produce the ticket whilst blocking the film for the people in the row behind me.
After the film I handed him my ticket and asked if was ok for me to leave the building without my ticket. Turns out it was.