Which is, in and of itself, proof that there is no designer.

"Here is the most important organ in the body. Without it, none of the others are any good. To all intents and purposes, the rest of the body is a life-support system for it. So where shall I put it? Safe in the body cavity behind layers of bone and muscle, close to its blood and oxygen supply? Of course not, I'll stick it out at the front or up at the top! On the end of a fragile talk that can be snapped by an awkward fall, crushed by a single blow or severed by anything reasonably sharp!"

Intelligent design, my arse!