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Also this. And it's usually after they've queued for what is definitely enough time to have worked out where they payment method lives.
Or people who feck off to get something else when their stuff is dangerously close to the cashier or they're half way through self service check out. If you haven't finished shopping, don't go to the till. If you've forgotten something it can be gone back for after you've checked out (if you're shopping with someone else to watch the stuff) or if solo, it wasn't important enough to remember on the first go round.
Pricks who, in a busy supermarket, don't pack items as they scan at a self service till. Big queue forming, people getting pissed off, eyeing up potentially free tills. "Oh, that guy has just paid, must be my turn". Nope, they have to thumb open their plastic bag (which they probably didn't pay for) and lift each item, one by one, a second (third if you count putting it into their basket) time and put it into the bag.