The dead give away for me is that 3 sentences into any conversation, an NT will begin to jump to an abastraction or theory. For example:
Sentence #1 "That was a great hit. Go Mets!"
Sentence # 2: "Yeah. That's his second double tonight. He's got a little pop in his bat."
Sentence #3: Yeah...Did you know that the difference between a hacker and a hall of famer is 3.5 hits versus 2.5 hits out of 10. Do you think that it is a purely physical phenomenom, as in athletic strength and timing? Or slightly different, as in an innate ability to transcribe the velocity of the ball and change the direction using an opposing force? Or alternatively, is it purely attitudinal: the batter is slightly more successful at striking the ball simply because he beleives he can? What is the effect of belief system on getting base hits consistently? Do you think that could be measured? If you measured it, would you blah, blah, blah."