Gas-lit in the chippy who said I asked for a plain burger, and then asked for another plain burger, when I wanted a double decker burger, and then a jumbo hot dog. When the order was finally completed (after what felt like decades), I asked if there was any difference in price to be told "no, the burgers still in there".
It put me in a right old mood not getting home til 6.40pm, and then my chips were cold.