Well, I don't know many, but I think they like to watch people. They would be using a tertiary function, so it would be weak-ish and not very developed, until they got older, so age matters with the Se of an INTP. But it's the Ti/Se blend that makes them be able to really make things work. And it the Ti/Ne blend that makes them make ideas work, and fit ideas together to form a myriad of thoughts and possibilities. It's when they run out of Se motivation for some reason that the 'mad scientist' Ti/Si looping or eventual adhesion occurs, and when they walk around not seeing things or with their head in the clouds. But I don't think that's their most balanced state. Same goes for ISTP. They can be very Ti/Se and Ti/Ne, very intuitive as they age, more so than using Ti/Ni unless they introvert too much for some reason, resulting in paranoid delusions.
I don't know about you, but I'm going to run and hide now before Z gets back............
So many people think the same thing about INTPs. They have all this knowledge about S things, but they dont step out into the world. I know I really need to let my N out into the world which is what I do on here. My Ti though struggles to explain. I have to take an INTJ approach. I have to gather up knowledge first. Where me and say an INTJ split is that I then put myself at the disposal of the person to ask questions or just talk, my understanding takes over. An INTJ reverts to "teaching" and how best to explain. Think of teaching like a single platter hard drive where it works optimally when structured with data sequentially. The way I process would be more along the lines of tiny platters, but a huge number of them and each one has pertinent info all lined up vertically across the platters so I can jump from platter to platter. With multiple heads I can access more then one platter at a time and they actually follow each other because as one platter rotates the others follow and pertinent data is still vertically aligned.
No one on here really scares me. Qre has come the closest, but its enjoyed.