Everyone should do their duty to expose science to the masses. Recently it was addressed that I haven't done my part, and so I'm taking this Sunday to explain a fine principle of marine biology. The following is an educational diagram for why sharks are just about perfect.
If you require a deeper argument, consider: it constantly swims towards A) eating or B) making little sharks. As you can plainly see, the shark is as close to an eating-things tube as it gets without turning into a worm. And no one thinks worms are cooler than sharks.