Want to know how my keys got locked in the car? I think habit is the root cause. Normally, when I arrive home, I check that I'm on the driveway (and not parked on the neighbor's lawn), turn off the car, remove the keys from the ignition and immediately exit the car. Tonight what happened was that jebra called me on my cell phone. I was four houses from home at the time and, since I don't talk on the phone when I'm driving, I let it ring. After I backed into our driveway and checked that I was really on the driveway, I turned off motor and pulled the keys out of the ignition. Then I wrestled my phone out of my bag and returned jebra's call, not noticing that while digging for the phone I'd let go of the keys and that instead of falling into my pocket, they had slipped to the side and were now on the driver's seat.
Which I didn't notice until after I'd locked and closed the car door.