I was behind a moron in line at Walmart last week that put all her things on the belt to be checked out, then decided she needed aluminum foil... She left all her stuff and went to get the foil. I just went in front of her to check out my little bit of things (express lanes were long), then when I was done she still wasn't back... Never run into anyone like that at Walmart though. Though I do think I had a semi-similar situation somewhere, probably a customer at work talking to me about the bunch of girls in the place or something, I just played along and went on my way...