We've been playing various forms of Peekaboo with Roo for many months. This morning, she was in her high chair and Gran was feeding her breakfast. Gran would pull Roo's bib up over Roo's face, then pull it down and cry, "Peekaboo!"
Then Roo started grabbing the bib herself, doing the hiding and revealing all by herself. The expectant look on her face when she pulled the bib down was beyond price.
She was rewarded with many cries of "Peekaboo!" And I think my heart flipped over, like, five times.