We followed this rule, First Come First Served. But sometimes we couldn't help it. Once a while we did break the rule.
Today was a busy day as yesterday was a holiday. So the customers was waiting patiently. One customer wanted to put her stuff on the counter so I helped her.
Another customer beside her got impatient and said, "Hey, I have been waiting here for so long!"
I said, "Oh, it's your turn. I'm justing helping her to put her stuff."
He was silent and nodded his head..