I'm always happy when Moira figures out something esoteric. Like toasting, which I've tried to show her before and she was having none of it. Put her in a room with 24 other people all toasting, and she will jump on that bandwagon. Then repeat it so I can get pictures.
Thanks to Popcap games, she has also learned to say zombie, pronounced "Ombie!" She loves watching me play "Plants vs Zombies", show me where to plant flowers and then yell when the zombies show up "No! No ombie!" Hours of entertainment, for both of us. Plus, useful training for the coming zombie apocalypse.