Evaluate the area you're going into (obviously) for potential "bad guy" types. But also evaluate for potential "target" types. If someone is just so distracted or distract-ing that they're asking to get their purse (or someone else's purse) snatched or whatever, it's a red flag for me. That being considered, Wally World parking lots late Sunday mornings are a strong avoid spot for me. "Do gooders" handing out money to beggars are often VERY lax in their purse/wallet discipline.
ANY TIME a car pulls up and asks "What time is it?" you're going to get robbed. Look them squarely in the eye and say "I don't know", then seek safety/cover etc.
Convenience stores where I can't see the clerks.
Sgt Lumpy - n0eq