I've been watching that show on Animal Planet about the animals of the future and alot of those PBS documentaries on evolution and such things, and I've come to a rational revelation of what will become the future dominant sentient lifeform on earth after humanity is extinct. Now image this... somewhere in the Mojave desert, a lone can of Spam is left by some hiker or camper, where the sands bury the tin of processed and pressed meat. It cooks for months under the unrelenting heat and then freezes from the starry frost, until finally the can explodes and releases the pre-irradiated pork, a seething battleground of preservatives and bacteria, that expands in thin moldy strata under the desert floor. The incredible challenge for the mutating Spam to survive in this incredibly adverse environment turns the soupy legacy of luncheon meat carnivirous. The rush of new nutrients initiate unimaginable cellular acceleration until centuries later, strange crude descendents of the tin begin chasing their prey and learn to create structures to protect itself from the extremes of the desert. Soon family groups of Spam become tribes, and further adaptations develop digits and larger cranial expanses. An ice age comes and goes, turning the desert into more hospitable patches of areable land on which sentient proto-intelligent Spam beings as family groups become tribes, and tribes become settlements, and settlements become cities. Man long forgotten, spongy telepathic globular Spamians possess the Earth. It could happen. Really. Would you expect that some malcontent sea enzymes would crawl out of the sea, into the trees, out onto the savanna, and finally put on expensive sneakers? I step away from the dynamic flow of life and I've noted that alot of life is perfectly ridiculous. The more perfectly ridiculous the concept, the more possible I can see it happen. When in doubt, always expect the utterly absurd.