I rarely think like that...only if I see some signs of aggression or potential conflict...then my mind usually starts assessing options, attacks, escapes, etc.
My mind usually focuses on which person is either talking to me, themselves, or wearing one of those damn blue tooth phones...my next thought is thanking our blue tooth friend for sharing all their personal business with everyone in line. Then my mind wanders to how oblivious/rude they are holding up the line trying to take phone orders at the register and finally all is forgiven upon gazing upon the holiest of the holy's, Gods finest creation, the Apple Fritter. Mongo like apple fritters.