Dear customers: we can't read your mind. Please use your words.
I was working on an express lane today, and while I was checking a customer out, another woman came up and started putting her stuff on the belt. She then walked off without saying a word, so I could only assume that she realized she forgot something and was going to get it. I went ahead and scanned and bagged her stuff. Eventually, another customer walked up with just one item and the other lady was still nowhere to be seen, so I saved her transaction and quickly rang up the woman with the one item. The other lady then came back as the woman was running her card. It took literally five seconds for her to tap her card, grab her item, and for me to recall the other lady's transaction on the screen. But she was pissed that I "helped someone else". And as it turned out, the half gallon of milk she had gotten was supposedly leaking (I didn't notice it leaking when I scanned it, but whatever), so she'd gone back to grab another one. She then complained that she "had a bad foot" and had to walk back there to get it herself because "there was no one here to help me." Yeah...this is the express lane and I don't typically have a bagger. If you'd simply opened your mouth and let me know that you needed another milk, I would have gladly called someone over to go get it for you. Then she said how whoever stocked the milk should have noticed it leaking (even though she didn't notice it till she got to the register, and I didn't notice it, so clearly it wasn't super obvious and the dairy clerk is human too), and told me again what "poor customer service" it was for me to ring up the other lady before she got back. Yep, I'm so sorry I can't read minds and that I didn't make the lady with one item just stand there and wait when I had no idea when you were coming back.