"Well, Saturned, I think it's important to note that..."
Haha, in all seriousness though. I think it's nice to be able to try to type people and get to know them better, but the danger with MBTI is that you see these generalizations in your daily life in people, (without even really testing their type, just taking educated guesses-) and then after a while develop these strange theories about different types. (I have a few theories myself that are probably just wrong.) Once you develop the theory it kind of impedes your ability to accurately type people, because you see people who have these qualities that you think types possess and then mistype them, completely defeating the point. So, "Oh I saw this person who was really dumb and takes everything literally and also is really into cars and rock concerts." Must be an SP. And then assume, "If they're an SP then they must also have all these other characteristics." Well, none of this stuff really says anything about someone's cognitive processes... I'm rambling myself... The point is that there is a big danger in making these huge generalizations because then it can get you into a big mistyping mess, which kind of defeats the purpose of MBTI.. (Understanding people better...)
Edit: Just reread the post... "Big danger" was really dramatic, but I'm leaving it because it makes me giggle.