What your favorite little animation detail?

So, like many of you I too am in love with the animation style and art direction of Arcane. However, among all the fine details, I want draw attention to the mouth, or more precisely; The Teeth.

I don't know why but anytime I watch this show I am just drawn to the details in the mouth. The visceral nature of anger, the spit, the wrinkles and cuts, the fact that each tooth and gum space is present, the often present tooth gap for several charcaters. So many other cartoons tend to never fully animate the teeth, or just use the generic block of white, or over compensate by putting details in the other parts of the face.

I'm sure it's a weird detail to hyper fixate on, but to any and all the animators who worked on the show, I am sold on the mouth and teeth animations. Something about it just makes the emotions during the heated or sad moments more Intense. Visceral is the word I would use.

I almost wonder if the facial emotions would have been as powerful if the detail for the mouths has not been as, well, detailed. Thoughts? Or any other animation detail you noticed are hyper detailed?