Its not strange but here is my funniest episode of complaining.
I managed a customer service department at a convention center, one of our services was electrical. So I am heading over to the desk and a customer is at it talking to Ron, one of my reps. As I get there I hear Ron yelling stuff like "I ought to jump this desk and punch you in the face."
I mean Ron was crazy but this was over the top even for him. I grab the invoice and start apologizing to the customer. But a second in I turn to Ron and say actually I owe you the apology. I looked a the customer and started to walk away. As I did I heard Ron say to him.
"Let me get this straight, you work for Con Edison, and you have the balls to complain to someone about your electrical bill"