I've been following this thread and was telling myself how fortunate I was not to have had a really bad restaurant experience in a long time. That changed this a few hours ago....
My son and I took my wife to breakfast this morning for Mother's Day. We decided to try a new place on the other side of town. When we got there the place was very busy that we thought was a good sign. The server introduced herself punctually and got our drinks quickly. Then we waited over 1/2 hour for the food to arrive. During that time, the party of eight next to us (who were seated when we arrived) got up and left without ordering anything. Another couple near us was waiting quite a while for their order and the woman made a comment to my wife about the slow service.
Finally, the server brought over our toast, which was cold so we sent it back. She re-heated our original slices of bread! When we got the food, it was okay but not great. Our son ordered a waffle with apple topping (looked like pie filling) and the apples were still frozen. The finishing touch was me finding dirt at the bottom of my glass of Coke after I drank most of it.
The server and hostess didn't ask if we were pleased...it was obvious that we weren't. I'm pretty much non-confrontational, so we paid the bill, left a tip, and will never go back there again. I wish them well.