I walked out the door, to drive the girls to school, thinking, "Don't lock the front door. Don't lock the front door." As we parked and the girls clambered out of the car, I thought, "Shit. I think I locked the front door." Upon arriving back at the house, I swore a little more creatively as I tried to open the locked door.
The problem is that my house keys are on a keychain attached to my wallet in my purse, which I still don't always think to grab. The only thing that saved me from standing on my front porch was that Archie is on vacation and was still in bed. He grouchily said, as he opened the door, "Forgot your keys again?"
I may have to address the issue of having my house keys and my car keys on separate keychains.