Only real bad experience I had was when I was at a Burger King with my mother back when I was like 9. We went in there and my mom was ordering the food for me, they got it and I think we literally waited there for like 30-40 minutes just waiting for our food. I remembering other people actually getting impatient(Since they were waiting for their food orders too). I think I remember one employee literally just sitting or standing acting like a twat.
Eventually we got our food, I can't remember if it was good or not. But I remember getting one of those Pokemon golden cards so it was worth it.
I guess that's not nearly as bad, but hey it's something.