I see idiots doing that at gun shows a lot. Had a kid ( 24-27) maybe tell Me He was a personal firearms trainer when He picked up My Buddies 686. Open it, looked at it, spun the cylinder forever, like that will tell Him anything. Slapped it shut, aimed at the ceiling and dry fired several times. Then started shaking it like He saw some girl do at another table. By then I got to Him and ripped the gun out of his hand. He said 'that hurt' and My reply was 'GOOD'. When He told Me He was a firearms expert I actually told Him He was to stupid to even walk upright. Needless to say He was asked to leave the show. Now when I show someone a revolver I tell them not to close the cylinder, that I will do that. On the better guns I put a zip tie around the cylinder now.