One of the first things that we did when we moved into this house were to install latches across the tops of two doors leading outside. (Luke quickly discovered that he could move a chair to the door to stand on and easily undo the latches. Actually, as I write this I can hear him trying to get the latches open.) Then we put locks on our backyard gates. People don't believe me when I say that he is always trying to escape. Yes, he must hate us. That is the only explanation. Why else would he be constantly running away?
The other day I caught Luke trying a new way to escape. I love the kid logic in this. You can see the progression in this picture. He first moved a ball to the fence, then the little play thing, then a step stool, and then an even higher step stool. Poor kid. He still can't figure out why he can't get over the fence.