Certainly I've had the experience of thinking a person was one thing, and finding out they were another.
“Of, course it always cheers a news editor when a story has what we describe as 'legs' therefore it, erm, runs.”
“I also remember the second band I was in ever. We were called Hybrid. We got a show at this local street fair, and we were playing on the back of a flatbed truck. There was an ad in the paper, and it said that 'Hybird' is playing. I was so mad.”