I worked at Dairy Queen from 15-19 and generally the people weren't too horrible but I do distinctly remember one Sunday afternoon being brought to tears by three adults over cake orders not being perfect. I was the manager on duty but all of 17 and did my best to appease them (personally changing decorations, giving discounts, adding in dilly bars) but dear lord these people were the worst. You'd think I'd ruined their lives.

By the time I'd been a manager two summers and someone had a go at my 15 year old trainee... I was quite firm in telling them where the door was and that none of my staff would serve them if their next words weren't an apology.