Open Question: have you ever said something dumb at a job interview?

Today I had my first job interview at sams club and one question she asked me was, whats one rule that you have to follow that you agree with? Well the first rule that popped into my head was the no tolerance for fighting at my school. Haha so I said that and talked about how you should respect others and be kind. But when I was done talking she looked surprised and in a sarcastic way was like, "oh so no fighting?" so two questions. Honestly do you think I f**ked it up? And how did your first job interview go?