Taking a page from our friend Marcus, I decided to mess with Bella and let her do some 'magic.' (They played this trick on their son using a gas fireplace with a remote.)
We were at the library, which has automatic doors. So I suggested that Bella say the magic word (Abracadabra! of course) to open them for us. And then again to close them once we were through. The awe in her face was awesome. Even funnier, how she says "Abracadabra!"