I'm writing an article on things not to say to your customer. I have a few ideas, but I'm looking for a few more. Possibly things you've said that either backfired on you or you just flat out should not say. Here are some that I've actually seen my co-workers in the past say to customers:

1) "Sorry for the hold, I had diarrhea and had to use the bathroom" I'm not kidding you. My co-worker said this to a customer on live chat.

2) "Just stop complaining" Yups