Some things clue me in to certain types, but it's not concrete. For instance, if I see like a blonde sorority girl who's really preppy and asks very Reese Witherspoonish I will probably automatically hypothesize that she's an ESFJ or ESFP. Then if I see like a bad ass biker guy who seems wreckless, confident, is covered in tattoos, and has like hoop earrings then I will probably think that is some sort of SP type. If I see a professor at a college who seems very spacey, with his head up in the clouds, and has really strange hair, seems to have poor social skills, seems ingenious, and seems very cold an rational then I usually think he's like an INTx. Also, if I see a guy who is decked out in "Hot Topic" gear with his nails painted black, has an emo cut, looks depressed, and seems very artistic then I will probably think that he is some type of IxFx and that he is an enneagram 4.