Years ago, before we had kids, I remember someone telling me a story about a 2 and 4 year old that covered a bedroom in baby powder. I asked the storyteller, "Who was watching them?! How does that happen?" This person, most likely a parent themselves, chuckled and blew off my question.
Three days ago I walked into the kitchen to find Sam (2 1/2) sitting at the table. There was a full cup of apple juice splashed across the table. Dry cereal was scattered here and there. And Sam had dipped my DS stylus into a tube of chapstick and plucked out the entire contents. He was playing Mario Brothers on a chapstick smeared screen. I did not pause to ask, "Who was watching this boy? How did this happen?" No. I now know these things just happen. Not only was I just down the hall, but his father and grandmother were too.
At least when he is asleep I know there's no mischief.