The position of the person - side of car they are on, any other vehicles near, what are they wearing, are they alone, anything in their hands, anyone else nearby.... Many things go through my mind at one time. Just standing there... Could be sus, maybe innocent or maybe waiting for an easy mark. Could be working with others, could be drugged up, could be homeless. Just standing there by my car at night and I don't know you....creeper vibes.