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I couldn't resist. For now, I've only looked at the Necropolis units because, as I understand it, the amusing animation only plays for the unit that's currently waiting for its turn.
I mentioned the vampires – they pretend to be cool guitarists, showing the "devil horns" and waving their hair to the appropriate music.
Ghosts waltz. Also to music.
Ghouls seem to be posing in some incomprehensible way: they wave their claws, then they do something funny with their leg. Maybe they're trying to imitate some kind of superhero.
Liches perform a demonstration flight on their staff. You know, probably the classic – wooden sticks with a horse's head. It's roughly the same.
Lamassus stretch like cats.
Skeletons just turn their heads, creaking their bones. Maybe I didn't have the patience to look closely.
Spiderlings sneeze, which makes their bellies swell in a creepy way. I didn't have the patience to watch the animation of the human version.
Maybe I should start a separate thread for this.