I was in Lidl with half a trolley of stuff and a new checkout opened which I went to. The man with 3 items went in front and I started loading my trolley on the checkout. Then the woman behind me started loading her stuff on as well.
The space she left me was not enough to put my shopping in so I was doing my best checkout Jenga moves.
Is it ok to start piling on your shopping before the person in front has finished, and if not, is it ok to say something or seethe quietly at their lack of patience???