I noticed something about conversations I have with my INTJ friend, that in my own personal experiences seem related to a characteristic I had with a previous INTJ friend. When we both make assertions at each other, we tend to end them with question marks, even if they aren't questions. An example being like "It's not my fault that you're wrong?" as a response to an initial question or something, in which the question mark serves no purpose except to soften the inevitable blow of the statement by making the punctuation open-ended.
This only happens when I talk with other INTJs! It's enough to make me wonder if anyone else has experienced this passive-aggressive kind of gig, esp. on the internet, where punctuation in english comes as a free and easy commodity. Has anyone else ever observed this, possibly in any other types or anything?