So, a fact about having a boy that nobody ever told me... blood engorges the Boy Part, creating a (not-so-)tiny piece of Boy Lumber. It happens, I guess, the same way it does for an adult: during sleep, during excitement, and randomly.
The Boy just started squirming and complaining, and Mommy checked the diaper to see if he had to go potty. Nope. The Boy was sporting an impressive... eleventh finger.
Good for you, Boy. I'm proud of you!