Creative peek a boo games

Theo really likes peek a boo. He initiates this type of play several times a day in many forms. He will get next to a door and swing it back and forth, he'll just lean behind an object with a mischievous grin on his face, he'll squat behind objects, he'll cover his eyes with his hands, or hide behind his sippy cup. Of course he loves it when mom or dad starts a game too.