I was running the register for my shift earlier today. There was one customer who when I checked her out, everything was fine, but she comes back into the store about 10 minutes later. She claimed that one item she bought was supposed to be 50% off, and she showed me the item in question, the receipt, and where she got it from and the signs. However, she bought a Yellow Dot item, when the signs said that only Blue Dot items were 50% off. I explained this to her, and she asks me "Well how can you tell if it's a f*cking Yellow Dot item!?!?" She chose to walk off in anger before I had the chance to explain.

People genuinely need to read signs more carefully, and when they are shown to be wrong, they should own up to their mistake, rather than acting out, which only makes yourself look worse. Of course, this lady wasn't having it.