ENTP's - I'm not good at typing them IRL. There was that video someone posted up here once of an Aussie fella, but he was acting up for the camera. I've never met anyone like that IRL, and if I did, I would just walk away.
Apart from that, I think one of the best friends I have had in years (sadly I moved away after a year) was probaby an ENTP. Our difference was, predictably, that he was more Ne and I was more Ti-Si (surprise surprise), i.e., he would be making connections I wasn't getting, and I would be deconstructing or pointing out empirical flaws. But it worked well, as we shared the same basic "vision", with him expanding my mind, while I refined his vision.
INTJ's - there's a definite "edge" there whenever I interact with an INTJ. To be fair, again, I've been friends with this type, though I would say I have found it more frustrating than interacting with an ENTP, as we always run up against the difference that they want to deduce and I want to extrapolate - i.e. they want to end the conversation with a definitive classification and move onto the next issue, whereas I want to get to the most precise yet all-encompassing definition possible. I kind of feel they are being simplistic, and they view me as impractical. This is the type I get most impatient with of the NT's IRL.
ENTJ's - one of my best friends was an ENTJ. I've known a few as they are very active politically as a type. I actually don't find them intimidating as I have worked out how to "push the buttons" of this type - they value knowledge, empirical precision and logical consistency very highly, and an INTP through the Ti-Si combination can really "throw a spanner in the works" when we disagree with them. Though I find it harder to have a constructive relationship with this type than with the ENTP though, as they seem less inclined to let themselves be corrected.
Though it can be a good combination if the ENTJ is leading a project and I am part of it. Generally though they seem wary of me, but we also socially can get on pretty well as they respect and enjoy intellectual sparring.