Once we were sitting curbside waiting for the start of MSEP or Spectromagic (sniff). A castmember on crowd control duty had the block in front of us and she was quite energetic about engaging the guests in her area, especially the kids, with trivia questions and such.
As the parade approached, the area intro music began ... she immediately broke into a twirling expressive dance that was timed perfectly to the music - and as it came to a transition she swept her hands up high and quickly back down - and the lights went out. When our eyes adjusted she was gone. Quite cool. I'd have put in her name for a magical moment creator if I'd thought to get it before hand!