If you hop the counter it's no longer a customer issue and is now a personal safety issue.
Way back when, my boss remade this lady's food 3 times. She would eat 3/4ths of it and then say she found a hair. The last time my boss refused and the lady balled it up and hit her in the face with it.
Bosslady (35ish and hood) slid across the counter like a pro wrestler hopping the ropes and chased her ass out of the store while calling her all kinds of bytches and hoes
Police came and asked if bosslady wanted to press charges for assualt