I was just thinking; I don't remember the last time I met somebody I found boring. There's always some angle that makes people interesting to me. I probably wouldn't notice if I found someone boring, since I just zone out and answer automatically and look interested.
I don't think I'm boring. However, my mother gets an extremely 'eyes glazing over' look when I tell her about something I'm passionate about. That might just be because she doesn't share my fields of interest and I often overwhelm her with information in a desperate attempt to avoid discussion of, say, my sex life, which she over the last couple of years decided that 'grown-ups' can talk about.
Heck, I'm probably quite boring, but sheltered from the knowledge since the rest of the world hides it from me