Ouch! Yes, I have had similar embarrassing moments, once I pulled a card out of a machine that was empty, took three steps away to be tapped on the shoulder by a lady who said, EXCUSE ME, you have my slot card. Fortunately I was fast thinking enough to say; OH, I thought it had been forgotten and I was going to take it up to the security desk to make sure it got back to you before handing it over to her red faced and making a fast disappearance.