Sarah has started playing Peek-a-Boo with us. She does it when we go upstairs to get her out of her crib in the morning. She does it when we're changing her diaper.
She did it last night when I placed the blanket on her while she was hanging out in her bouncy seat. She thinks it's hilarious. She pulls the blanket up over her face and then quickly pulls it back down and, even if you don't gleefully say "PEEK-A-BOO!" for her, she laughs and laughs and laughs. Piaget would say it's because she's developing object permanence, but I say it's because she's a Provost/Drueke and as a clan we know funny. And come on, that's some funny stuff right there.