Nor will one ever witness a chimp turning into a human... That'd be unethical in millions of ways, we'd end up killing it, and surgery to replace the entire body would be pointless....
C'mon, man... You seem to be shouting with ear plugs on. We do not come straight from Apes. Tell me... Have you ever witnessed a GameBoy DS turn into a PSP?
If I were to say that evolution exists today, would you have a problem with it? That is, disregarding anything to do with early life, and only collecting data from about the last 500 years. We know of the genetic mutations that drive evolution, and have decoded atleast some of it. A very small change can change a lot. Or a little. Or nothing.
Now, to attack it at a religious angle. Surely G_d knows what we're capable of doing to the environment, and that it changes naturally on its own. Should life end just because it gets little colder, or the atmosphere slowly changes? Evolution makes sense. It's a system by which life can be changed.

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Build a man a fire, and he'll be warm for a night.
Set a man on fire, and he'll be warm the rest of his life.

Thanks to Shystie for avatar