When the green flag is clicked, both Scratch cats should be in the same position/rotation and should then start dancing in sync by rotating back and forth. They should stop dancing at the same time and both say "Fun!" at the same time. They should continue dancing in sync and then stop at the same time and say "Dance party!". They should resume dancing and then end in the same position that they started. Extension Challenge: Have the two sprites change positions with each other, smoothly, as if it's part of the dance, then have them return to their initial placements.
