For me it is when the person knows that they are going to pay for something and they do not prepare to do so.Next is the person who argues about an expired coupon! third is the person who does not unload their grocery cart until they get to the register. Fourth is the kid who disrupts the whole line with their antics.Fifth is the person who cannot find their ticket when they get to the door.Six is the 12 item line and the person with a whole cart full.