There are! There's ME! I found this forum whilst searching to see what makes me that way, or if there are others like me! Now, I would not say I cannot lie under any circumstances. If it's a knee bang reaction like, "Did you eat my cookie???" "No!" "Are you lying?" "...Yes." That may happen occasionally, but if I have to think about it I cannot do it. I have a theory about it but I'm not an expert. I have PTSD and social anxiety. I often get nervous when I have to talk. I hate confrontations, and I'm very impulsive with my speech. Also if I lied I would stress over the possibility of being caught, so I know it's easier for me just to be honest.