Not exactly client-related, but still involves dealing with customers. Oh, the joys of retail.
I work at a store that sells video games. To prevent younger children from buying "M" (mature) rated games, we make sure to ID anyone that looks underage. So, imagine my surprise when someone calls in and complains that we sold their son a copy of Grand Theft Auto 4. Now, this is the one game we make sure to tell parents about, so they know what they're buying for their kids. The conversation is as follows:
Customer: Is your manager in?
Me: No, he is not. is there anything I can help you with?
Customer: You sold my son a copy of GTA 4. HE IS TWELVE YEARS OLD.
Me: Sir, we would never sell anyone under the age of 17 a copy of that game. Your son could have not have possibly bought it from our store.
Customer: You sold my son a copy of GTA 4, which has DRUGS, SEX, AND ALCOHOL CONTENT. WHAT WERE YOU THINKING?!
Me: Sir, I assure you, we would not sell your son a copy of that game unless he had guardian approval. (As long as the boy had someone who was 17 or over with him and could vouch for him, there was nothing we could do about it.)
Customer: YOU PEOPLE ARE DISGUSTING. HOW COULD YOU SELL MY TWELVE YEAR OLD A COPY OF THIS GAME, THAT HAS VIOLENCE, DRUGS, AND SEX IN IT!
Me: Sir, we did not sell your son a copy of GTA 4. This is a game we would never sell to anyone under the age of 17. Are you sure he bought it from our store?
Customer: DO NOT RAISE YOUR VOICE AT ME. Now, you sold my son a copy of this game. Why would you sell a twelve year old boy this game.
Me: Sir, I am not raising my voice, I am trying to explain the situation to you. We would not have sold your son a copy of this game, unless he was with someone else who could have bought it for him.
He rants on for a bit more at our moral depravity. This goes on for a good five minutes. I finally ask him,
Me: Can you check the receipt for me, and see who sold it to him?
Customer: There is no receipt. It just came in your store bag.
At this point, I am slightly angry. He wasted a good 10 minutes of my time without proof that he bought it at my particular store.
Me: It could be possible that your son did not buy it from our store.
Customer: Well I assumed he did because it's the closest one, and it came in your bag!
Then, I hear him yelling for his son. More screaming ensues. Sounds like things are being broken.
Customer: DON'T WORRY, MY SON WILL NEVER COME TO YOUR STORE EVER AGAIN. *click*
Me: What the **** just happened?!
The kicker? We checked our inventory afterwards. It turns out no copies of GTA 4 were sold that day.