MUSCLES!

You can't imagine my surprise when, while doing something totally random with us-- like grocery shopping-- Nora began to grimace like Bill Bixby as he became the Incredible Hulk and hollered "MUSCLES!" Both her arms and round pink cheeks shook with "exertion".

On the sly, apparently, Fiona taught Nora that in order to show the world that one has muscles, one must flex, turn red in the face, and quiver mightily.