Supermarkets that don't put on a quick till manned by a person so that you either have to use the horrible self service tills or queue behind someone with a months worth of shopping to pay for.
People usually women who seem surprised when they have loaded all of their supermarket shopping into their trolley and then are asked to pay for it. Cue 10 minutes of searching in their handbag for their purse/card.
People (usually older ones) who don't work all week, who choose to go out and clog up the Post Office and supermarkets when they have all week to use these. :rant: