People who spend hours walking round Tescos putting things in a trolley, take it to the checkout, watch or help while its priced bagged and put away, and then have a fit of surprise when they are asked for payment, pat pockets search bag, empty contents, panic, take minutes to do something that a normal human being should do in seconds (or been prepared for in advance).
WTF did you think was going to happen next?
I may be showing my misanthropic tendencies, but A venn diagram for many of the lane hoggers, progress makers, trolley abandoners, speakerphone enthusiasts and political muppets mentioned in this thread would be pretty close to a circle.