"Imagine if you had to be careful every time you put fuel in your car, because if you weren't it could spill into the air intake and make your engine choke, perhaps causing it to fail permanently (as in die) if the spillage were large enough. No car designer would be stupid enough to put the fuel filler and the air intake inside the very same body cavity." - Neel Ingman, on the subject of the human throat.
Not Very Intelligent Design is a humorous look at the idea of intelligent design with regard to the human body. The authors, Neel and Mark Ingman, decide to assume, for the sake of argument, that the human body was designed by a creator, then go on to systematically rate each of its components in terms of the usefulness of the design. Body parts like the appendix and gallbladder, which we seem to be able to do without just fine, and which are liable to cause us enormous amounts of pain and/or try to kill us, score very low. Many of the more obviously useful parts also receive a low rating because it is possible to imagine a number of ways in which they could be improved (eg. wouldn't it be nice if a damaged spinal cord could heal itself as easily as an injured finger?), and indeed humanity has come up with ways to improve some of them (eg. glasses for short-sightedness, hats to prevent sunburn). Others lose points because, although we need them and they do their jobs well for a while, they tend to fall apart with age, or through accidents (eg. dentistry exists because our teeth rot and break, get impacted or grow in crooked).