I stopped by the library yesterday, and I parked next to an idling empty car (with open windows).  I've mentioned this before, but there was very little stopping me from stealing this vehicle.  And I thought about doing it just to prove a point -- that there's really no reason to leave your car idling in the parking lot while you enter a building to do something.  You're certainly not saving time, unless your vehicle requires a hand crank to start.  And if you think you're saving gas, think again.  I saw the vehicle's owner come out of the library just as I was entering, and I thought about asking her what ridiculously stupid ideas were going through her head when she made that decision.  But my social anxiety took over and I stared at the ground while walking away nervously. 

Related:  Idling SUVs, Idling planes #travel