Well, I just started watching the Muppet Show episode that aired the day I was born., which is an odd experience. While watching through season one, I noticed they’ve done two songs from Chicago so far, which surprised me, I didn’t know the broadway show was that old, but it was brand new then.
Also, on a related and very hilarious note, while re-reading through Girl Genius today, I noticed that in one scene, sitting on Gil’s workbench is a gorilla detector (with a post-it on it saying “Needs work!”). I just about died laughing, having just seen that episode.