Yeah, well, I'm kind of concerned since I did this: met a coworker in a busy parking lot to go for a 5 hour drive. When I returned, in the dark, my car was running...had been running the entire time! I had lost my car/home keys a week before. Couldn't find them for anything. So I got a replacement pair out of the junk drawer in my kitchen. I was exasperated that I had left my car running for all that time, but, thankfully, it hadn't been stolen. When we returned from our 5 hour trip, the lights were on and there it was running with the AC running full blast. I was perplexed as I drove home. Then, when I went into my house, unlocked the house to let myself in, and went to put my keys into the pocket of my purse...where I always put them...there were BOTH sets of keys in my hand....the ones I had lost PLUS the replacement keys. I have NO idea how this happened! Am I worried about forgetfullness!?? Yes!