I think most people think of themselves as nice, but we can all have a mean streak from time to time. When I was in high school, my best friend told me that her younger sister thought I was mean. I definitely wasn't the mean girl in school, but I guess I had treated my friend's freshman sister like an underling. It totally came as a shock to me, and since that day I've been more careful about coming off as unintentionally rude to other people. Has anyone ever accused you of being unkind?