Have you ever tried to open a coconut? It is like a brain puzzle from hell. The shell is titanium covered in strange bark shrapnel. You pound it on the counter. You drop it on the sidewalk. It will not open. So in a huff you make a run for your sharpest knife. But the bark shrapnel repels the blade, and you are left standing there, like a dolt, with an unopened coconut and a dull knife.
But you are persistent. You climb to the second floor and drop it from the balcony. When that doesn't work, you back over it with your fuel efficient SUV. Then you pound it with a hammer. You pray to your lord while laying hands on the unholy orb. And finally you power up your circular saw and bring the screaming blade to the brown enemy. But the spinning blade just shoots the coconut across your garage, and it crashes into your garden tools. And you remove your safety goggles and make a perplexed expression. Nature has beaten you. The coconut has won.