Guys you seem right in the only way I have ever gotten it to repeat (doors locked with key in the ignition) is to hit the lock button on the key while I had the door open and then start the ignition. And with gloves on, I could see how I might have accidentally done that.
Like I said, I would have sworn I heard a click right after I closed the door, but I don't know how this would have happened. So, I'll chalk it up to my memory not being great at a time of high stress.
And thanks all those for sharing your similar stories, makes me feel like I'm not the only dumb a$$ out there.