Okay, when I was 7 I used to go to my grandparents a lot and take my bicycle and ride around their neighborhood because it was the best biking neighborhood - sidewalks and hilly and they had a huge sloping driveway. Well I had gone to my grandparents' house to ride, and my mom had come by to pick me up. Well, I had gotten mad about something, and I was ready to go. So I decided I was going to take myself home. My mom was holding my sister who was only a few months old talking to my grandparents. My mom drove an old car, and you could throw it into gear without the keys in the ignition. Well, I got in, threw it in reverse, and down the sloping driveway I went. Right into a huge oaktree. BAM! If were not for the tree, I would have been sitting in my grandparents' neighbors' dining room!
My family still hasn't let me forget it.