Earlier someone mentioned how INTPs have great outer self-control combined with inner turmoil. I've located a couple of good examples for your edufication.
Johnny Depp, INTP
Excercises superb bodily control. His acting is though is very surface, stemming mostly from the keen observation and mimicry of the character he is portraying. His is not the type that emotionally inhabits his role. This allows him to have a spectacular range of characterizations but prevents him from convincingly portraying "serious" characters.
Usher, INTP
Deep down you know it's best for yourself but you
Hate the thought of her being with someone else
But you know that it's over
We know that it's through
Let it burn
Let it burn
Gotta let it burn