Reminds me of two situations I've seen, neither directly involving a gun -- as far as I know.
In some Italian cities, notably Naples, moped riders would stab a rear tire of a stopped car (usually a rental to take advantage of a non-local) then flag down the driver yelling, "Hey, you got a flat." The driver stops to investigate, opens the trunk to get the spare. While he can't see past the trunk lid, the moped riders empty the car. This happened to me about 25 years ago. Thankfully, the perp's motive was limited to sneak robbery. It could easily have been something more sinister.
In Belgium, as in many European countries, oncoming traffic on a "through" street or road must yield to crossing or entering traffic from a side street unless that entering traffic has yield markings, usually on the road surface itself. American military drivers were specifically trained on this point. As you can imagine, these markings are often invisible to the through motorist. Local drivers would select a visually shielded intersection and pull out when they saw a car with international/diplomatic plates approaching, taking advantage of the oncoming driver's unfamiliarity with the yield law and trying to get hit. When they succeeded at this, the victimized driver had an at-fault collision rap that was nearly impossible to beat. And again, on a secluded road, the motive could have been more sinister.
The lesson is obvious.
