That the saving grace of self-checkout lines; it tends to be one line for a dozen checkouts. So the dense fucker clasping their block of cheese to their chest - in the manner of fleeing refugee carrying a child - while the machine repeatedly begs them to "please place the item in the bagging area" only slows down the line a little bit, but the Hutt going supernova at the cashier because they can't use a different supermarket's app's discount code for 15% off Kleenex on a 3L bottle of Pepsi and demanding to see the manager grinds everything to a halt until they're adequately soothed.