I can't believe nobody has said this: SUNFISH. I've seen these abominations in aquariums and they are hideous. They eat jellyfish (I believe) so they are always pock marked with scars and stings, and covered in parasites. They come to the surface and lay flat...letting birds and fish eat the parasites off them. I often sit and wonder HOW THE HELL THIS THING MADE IT. Seriously...Darwin? Natural Selection? This thing? I can't believe this is the best nature could do. I won't believe it.