... It created this work of art:
To be clear, I didn't modify the animation data itself at all that was used in my latest animation. I was only adding some more control features for the head rigging to make animating it easier. Often when modifying the rig like that, the animation data that was created using an older version of the rig will change in ways that could be minor or major. This gif is an example of that, and I thought it was actually quite hilarious, so I thought I'd share it in a journal entry.