It made me think of how my wife accidentally set off the car alarm a few times. It was winter (or California's definition there of) when we got the Expedition. More than once I would leave my wife in the Expedition while I ran into the store. Out of habit I would lock the doors as I left. When I came back she would push the unlock button on the interior and the alarm would go off a few seconds later.
NOTE1: Winter - New California Dictionary - the time of year when it might rain and you don't need to run the A/C. Summer - the time of year when a good parking spot is defined by the amount of shade, not the distance from the door. Spring - What's that? Fall - What's that?
NOTE2: Leaving my wife in the car saves an average of 75% on trips into the store. However, it increases the likelihood of another trip to get items forgotten. Net affect though is still a savings.