So this really gets my back up but have never voiced it before. So there you are at the checkout putting your stuff from your large trolley load of stuff onto the belt and someone comes up from behind and starts putting things on the belt from their basket/trolley. You haven't finished putting your stuff on and before you know where you are their stuff starts moving along the belt. So AIBU and what pleasant comment can I utter when this happens to me again?
Lighthearted, I know there are worse problems but it just gets up my nose.