Fish have always seemed to be missing something, I've decided it's hands. I Don get how they move things around in the sea or in streams. All that fast flowing water must make it hard for them to control where their things end up.
Plus, I like the idea that fish could shake hands with each other because they've always seemed like formal creatures. They've got schools and that and their natural predator the penguin generally looks like they're wearing suits so it's nice to think they are at some form of corporate war with one another.