Sponge
It does seem a little weird that we would kill an animal, let it decompose and then use it to clean ourselves with - that's what we do with sponges. It is probably lucky that other creatures aren't quite so soft when they're dead.
At least sponges are not bitter about it. They don't seem to mind at all. They even go out of their way to entertain us by growing in comedy shapes. Most of these shapes are too rude for this website but sometimes we see one that's not. We love this one!