Aye, Aye captain!

I don't know why, but at the grocery store today Caibo decided I was the captain. He kept saying "aye aye captain!" all the way through the store. We was even pretending that the shopping cart was a rocket ship. At one point he got down in the middle of the aisle and swabbed the deck, or at least pretended to. When I made him get up and start going, he stopped and declared, "Oh no! I forget something!" He went and picked this imaginary thing up, and then I asked him what he forget. He replied, "My turtle" Sure enough, he had his arm to his side like he was carrying a turtle. Where does this kid get this stuff?