I have a slight permutation to this story. I haven't (knock on wood) forgotten my keys or locked them inside of something, but at a ride last week, I forgot to close my front car door and didn't realize it until we pulled back into the parking lot. So, while I had my keys with me and my purse was "locked" in my trunk, the car was visably open for the nearest thief. Luckily, no one had taken advantage of the situation and all was where I left it.