It would depend fully on who was the person looking at me, how they were looking at me, for how long they were looking at me, where I was when they looked at me… There's no single answer for this. I sort of pride myself on being able to read people and what motivates them rather quickly. I'd like to think that for the most part I can assess someone's motives for making a connection with me.
How did you pick up this ability to read people? I knew this guy in the city I used to live in, and he was phenomenal at it. Just by the way they were walking he could tell something about them. I mean, it wasn't tested to a fault, but there was a few instances where what he said proved itself to be more than just bullshit off the top of his head - and these were complete strangers.