pushing trolley down supermarket aisle, older couple. are having deep discussion over the merits of particular potatoes. The man has the trolley sideways, so he & partner totally blocking the aisle.
They look up, see people trying to get past, then ignore them.
On a polite "excuse me", get very dirty look, as it say how very dare I put them to so much trouble, before grudgingly moving over just a tiny bit. Why do so many people lack the most basic manners & courtesy???