I got told off yesterday for using the term "Chinese Whispers" as apparently it's offensive.
I hadn't realised it was (my wife and I both use it, she's half Chinese (Malaysian)), the person that told me was really lovely about it and didn't give me a hard time or anything just dropped me a note to suggest it wasn't the best use of language and was very diplomatic about it.
So there you go, learned something new today. I had no idea it was considered offensive.
My first reaction was clearly being mortified that I could have offended someone, but my second was "huh... so what IS the expression I should use?!".
I've never been particularly PC in my private life or amongst friends and family but always try hard at work to be mindful of my language, but this one slipped through the net.