one time my teacher was talking about a hypothetical situation and called me a bad name as part of it
I said 'shutup b****!' and the whole class laughed including the teacher for a good 1-2 minutes. I was always the quiet kid in class so it was a shocker to everyone. She was my favorite teacher and we knew each other pretty well so I knew she would know it was a joke.
I never got suspended from school before though