I was returning to my car in the Target parking lot yesterday having just picked up a prescription. My car is a silver Sienna and both my wife and son had decided to remain in the car while I ran in to get the prescription. I have to admit that my alert status was probably white, because I was looking at the prescription while I walked to make sure I had the right medication. Since my wife was in the car, I figured the car was unlocked and reached for the door and opened it... and realized I had opened the wrong car's door. There was no one in the car and I immediately shut the door. At this point I realized that my car was two cars over from where I was standing. The car door I had mistakenly opened belonged to a silver Odyssey.
In thinking about what happened, I've come to several conclusions. First, I need to keep my awareness at Yellow, especially when walking through a parking lot. I remember checking for cars before crossing from the doors of the store to the parking area, but other than that, my attention was on the prescription and that lack of awareness caused me to enter the wrong car.
Second, the person whose car I entered left their car unlocked. Bad idea, even if you're running into the store for something quick. If I had been a BG, I would have been able to enter the car unhindered and either stolen it, taken things from the car, or waited inside the car for the person to return.
Third, and this is the hypothetical part, I've thought about several scenarios where someone mistakenly opens the door to the wrong car. There could be people sitting in the car, or kids, or a dog. How would they react to someone opening the car door and almost getting in. What if someone had been in the car and pulled a gun on me? What if a dog attacked me? How would I justify defending myself when I've just opened someone else's car door?