Okay, I'm gonna try to answer this all serious-like.
I think I'm somewhat prejudiced against one group of people from a certain country. Don't wanna say specifically because that isn't really important. I dunno why. I haven't met very many people from there, but I have all these anecdotal stories from other people, from things I've read (and things that weren't prejudiced themselves or anything), that just sort of coalesced in my head and now I have this unfavorable mental image. Of course I know that's all it is, but still, it's something that pops up in my mind and I have to consciously push it aside.
I also have a knee-jerk reaction upon learning that someone I like/admire/respect/etc. is religious. Again, it's irrational and I know this, but causes a small mental storm that I have to weather. I do try to keep these things from affecting my actions though.