I once made myself lost. I was 4 years old, and my mom left me home alone for a few minutes while she went down the block to get my sister from school. It literally was down the block, and my mom left me alone plenty of times before. I wasn't tall enough to reach the locks, and I knew not to answer the phone. Well, I guess I was feeling very sweet that day and decided I needed to give my mom some flowers. So I somehow pushed over one of the kitchen chairs and stood on it to unlock the door. Went to our side yard and started picking "flowers" for my mom (really just purple weeds). My mom gets home, sees the door open, starts freaking out, yelling my name. I show up at the door with this handful of weeds and dirt all over my clothes. My mother was so relieved, I didn't get in trouble until later.
My mom once got left behind as a kid. She grew up in Russia, and they didn't have rest stops like we have here, so if you needed to go, you pulled over and found a bush. Which is what my mom and her parents did. My mom went with my grandma to find a private bush, and my grandma went back to the car leaving my mom to take care of business. I guess my grandparents got into a fight because they just started driving, assuming my mom was in the car. I think my mom was around 7 at the time.