Not coincidentally, I have recently discovered that they have a Pavlovian reaction to the soundtrack of Wicked.
Seriously. It's great. Hit the "play" button, they hear the first few notes,they snap into character and start belting emo witch songs. Stops conversations dead in their tracks.
Unrelated: My girls talk to Ceiling Cat, and push through their homework so they can listen to me read more Connie Willis stories. I am happy with my girls.