A short time later I went back in his room to check on him again and he was naked (sorry, no picture). I guess that I should be thankful for two things:
1. That he is twenty-eight months old and this is the first time that he has taken his diaper off.
2. That he did not pee or poop while his diaper was off.
After I put a new diaper on him, I declared nap time over. I wasn't in the mood for any further surprises.