Well, when I got home from work yesterday, I realized I was locked out! My car key generally has three keys attached to it, and one of them's my house key. I pulled it out of my pocket to discover only two keys -- and nope, not the one I needed!
Luckily, guinness_duck knew where his copy of my key was, and was home, so I could stop by and grab it. Gabriel greeted me by staring out the living room window as I got there. :-)
I don't think it's the first time I've somehow gotten locked out and had to get a spare key, but it's probably not more than the second time. I still don't want to try stashing a key outside the house, since that still feels like a security risk, but maybe I'll keep one in the car (not sure why I didn't already) for situations like this.
Also, I still have no idea where the house key vanished to. It wasn't in my pants pocket mixed up with other things, and it doesn't seem to be in pockets of the shorts I wore recently. Ah well. This is why we have spares.