I was sitting in my car in the parking lot of the beer store, playing a game on my phone, procrastinating on my mission to buy beer.
I had locked the door from pure paranoia (I'm just a paranoid guy).
A guy on the sidewalk stepped onto the parking lot and walked toward my car. I thought little of it, but I noticed. He got closer and closer, and then he grabbed the handle and tried to open the driver-side door.
It was locked so he casually kept walking like everything was normal.
It was broad daylight. I still have no idea what he would have done if the door had been unlocked. But I was sitting and in the more vulnerable position.