I just hope that wasn't too conceited.
I have this amazing ability to say things in a way that comes out "funny," even though I'm not trying to be clever or funny. It's just the way things come out. And I know that even though this isn't a "weakness" that I see, I do know that people can say, oh, he's just being clever/sarcastic/etc. I had a job interview where I met with a few people, and I was "being myself," and I didn't get the job. I felt that, among other things, I might have come off as flip, when I was being truthful.
It didn't help that at times I got nervous and caught myself turning inward and clamming up, but pulled out of it quickly.