I usually only pop in for a few things. But did a huge shop because of a voucher.
When it came to paying she mumbled "would you like a free sticky toy" I could hardly hear this, asked her to repeat it politely. Then I said sorry what is that, she rolled her eyes at me, turned around rolled her eyes at a colleague and said "its a toy when you spend over 10". I get she must get that a lot, but if she didn't mumble or they had signs up about this promotion it wouldn't confuse people. I've never heard of it before.