Hop on Pop

Ellie started to do a new trick. When I say "Hop on Pop" while laying on the ground, Ellie runs over and jumps on my back while giggling. She is now starting to understand some things that we say like: "Will you bring me a book?" "Will you bring this to mommy?" and "where's Elmo?" (referring to the Tickle Me Elmo toy she was recently given).