When was the first time that you stood up for yourself? Were your actions justifiable? Looking back, would you have done anything differently?
I've never had much of a problem arguing with people, including people in authority. If a some grown-up was telling me black was white, I would not say "Oh, OK, since you say so, it must be true." I'd say "Um, no, I'm 5 and even I know you're wrong."
A couple examples I can recall specifically:
Once in Sunday School we had a new preschool teacher who had us sitting on the carpet in a circle. It was a "quiet" activity, probably a book being read, and then she she said we were going to have "star juice." So she comes over with a pitcher and paper cups. Then she tells us how this star juice was squeezed out of the stars the night before and is magical. The cups are given out and its WATER. Water! Not star juice! I was 4 or 5 and argued. She did not say "pretend" it was star juice, she said it WAS star juice. Sorry, but even a pre-schooler knows the difference.
When I started kindergarten they put me through a battery of tests. One of them was flashcard with pictures we were supposed to identify. And there was a sun halfway over a horizon. What is it? I said sunset. But no, it was a sunrise! Um, how do you tell from a cartoon drawing? And isn't that close enough? And yes, I said as much and she said, oh, accept that. But um, no, obviously I didn't because I still remember this!
There are more but sorry, gotta go at the moment :)