Mine were quite bright, but still ridiculously undeveloped and silly and unable to develop plans at that age. For instance, when they were five and three, they decided they wanted to share a room, but for some reason thought I would not allow it. Therefore, they thought it would be better to move my daughter's toddler bed into my son's room without asking. They decided to do this "secretly" and started moving stuff without thinking about the fact that I was in the next room and could see them moving the mattress and frame between one room and the another. That still cracks me up.

Stopdog, I am sure there is not a 5 year old on the planet who could prevent abuse of any kind at that age. Five year olds are just not developed enough to plan or take control.

As an aside, one of the worst episodes that I can remember clearly happened when I was 8. I always thought of myself as basically a small grown up at that age. Watching my kids at that age, and my niece, it staggered me how small kids and intellectually immature even really smart kids are at that age.