The only thing I don't do is take a card out of the machine. A lot of times people will play nachines on both side of a carrousel and it would be really embarrasing to get caught sticking his slot card in your pocket. I had that happen a few weeks ago. With no one around a machine with a card in the holder, I was just getting ready to grab it when a guy came around the corner and took it back to the other machine he was playing. Almost a major OOOPS.