How annoying is that?
Today I went to Asda and BOTH people in front of me at the till did this.
Person one paid THREE different times, one for the majority of the shop, one for a few essentials ( milk, bread etc) and a third time for an item of clothing.
Person two then proceeded to pay for their shopping in two sections.
I was waiting bloody ages, fuming and wondering why these people can't just pay once and then divide it up later based on the receipt if they happen to be buying for other people.