The tendency to believe that we are more unpredictable than others. "I know what you're up to, but you can't see through me."
I've often said, "She's so predictable, so consistent!" I thought I could predict what others might do and they would be clueless about me because I'm more mysterious and spontaneous. So much for that illusion. This attributional-bias has an obvious role in the formation of stereotypes and prejudice.