I was queuing up at the supermarket checkout this morning, when the lady in front of me (with a small trolley sized shop) disappeared (cashier was still processing person in front of her). She arrived back 5 minutes later with a new full basket of shopping, which she proceeded to dump on top of her existing shopping. This increased the amount of items in her shop significantly.
To give her some credit, she did smile and apologise to me, and also she didn't shove my shopping backwards to fit her additional items onto the conveyor belt.
Now I will occasionally pop back to fetch one or two items that I had forgotten, whilst waiting at the checkout. But never a full basket load. I wasn't in a rush, but I did have frozen food in my shop, and I was anxious about it melting whilst I was waiting.
AIBU to think that when you arrive at the checkout you should have completed the majority of your shopping? Going to get one or two forgotten items is not unreasonable. But I think bringing back an additional full basket of shopping is.