I had the students in Theory walk up to the whiteboard to complete review exercises of basic rhythm and not names, I think they enjoyed the activity. I really enjoyed one moment when I was writing some music on the board with errors in each measure for them to identify (I had not told them yet what the purpose was of what I was writing), and not a moment after I drew the first bar line a student said, "Wait! There's something wrong with the first measure!" Awesome.
With a Lily in Your Hand (Eric Whitacre) - Polyphony (iTunes)
I forget earlier to mention that we have a daily listening journal activity for the GM classes, similar in nature to my Theory ritual. Today we played the William Tell Overture (Gioachino Rossini) for them, followed by this:
They loved it.