A former employee of Marks & Spencer (M&S) has highlighted four customer behaviors that irritate retail staff. One major complaint is when customers arrive just before closing time, making it difficult for employees to finish their shifts on time. Another issue is stingy customers who refuse to pay a small excess when exceeding their budget, often directing their frustration at the staff. Oversharing personal stories at the checkout can also make workers uncomfortable, as they are there to do their job rather than provide emotional support. Lastly, customers who fumble for change can slow down the checkout process, especially when they present the exact amount after the total has already been entered. Being aware of these habits can help create a more pleasant shopping environment for everyone involved.