How'd He Do That?!

Josiah usually goes down easily for his afternoon nap. But today he spent the first half hour after I laid him down screeching (not crying, but happily screeching loudly) and banging on the crib and wall. I finally went back up to quiet him and lay him back down, when much to my surprise, I found he had taken his pants off! And he had been wearing well-fitting jeans, not some loose, baggy sweat pants! He seemed so proud and excited. I put his pants back on, laid him down, and he went to sleep pretty quickly after that. What a funny little stinker! I still want to know how he did it!