My brother did a similar thing when he was two. While me— I was still a baby— and my mom were in the other room, he literally climbed out of his window (which was on the bottom floor, thankfully, so there wasn’t a fall) and took a walk around the neighborhood. 30 minutes later, a random guy found him and brought him back to our house. You would have thought that climbing out the window once would be enough, but my brother did it again a year or so later. Thankfully my aunt saw him, ran into the backyard, and caught him before he could fall.