Well this was a first. Earlier this evening I left Bertha while I was talking on the phone and roared off in a borrowed car for an appointment. When I returned just now I found the door locked. I'm thinking...I don't remember locking the door, but I guess I was on the phone so maybe I did it without thinking. Except that I don't have the keys anywhere. I double-check the car. I go inside the house. No luck. Finally I think, it's late, it's dark, I'll just try to break in.

I won't tell you how, but it was quite comical and I was glad to be surrounded by darkness and trees and, just in case you're worried, this method of break-in-age would not be available were I anywhere but the completely safe driveway where I am currently parked. ;) 

Once I got in I found the keys on the counter. I have no idea what happened -- maybe the lock slipped when I slammed the door shut...