Her bite is worse than her bark

Standing second in line at the checkout, I observe the lady in front of me being very mean to the cashier.  The lady was yelling at the young cashier and the manager called in to resolve the problem.  In addition to a very large and loud mouth, I noticed the lady had a very unfortunate dental situation going on.  By the time the lady walked away the poor little cashier looked like she was ready to cry.  The manager briefly consoled the cashier, I stepped up, in an attempt to cheer up the cashier said, 'Hi, don't worry about anything she said.  She is just mad because she can't get her dentist to return any of her calls.  Her teeth look like they are fighting for position!' They both laughed and the cashier appeared a bit more at ease.