That is the most surprised look I've ever seen an artist give to a rat! It's a masterful piece of emotion, its like the rat has discovered that is wife just ran off with the rat milkman and took with her the moldy pretzel combo that was surprised rat's pride and joy. He was saving that for the annual plague holiday!
You know what the rat is thinking: Didn't he mark everything with enough urine? Weren't his ears pink enough? Sure, he had two nostrils on the same side of his head, but that's no reason to leave him!
Our chained man has about had it with the skeleton, but honestly, it's his fault, who gets in a weight loss competition with a skeleton? And expect to win?
Hell, even the rat isn't surprised by that!