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Stompy: Sounds like everyone has pretty much answered your question. In summary, while everything is possible with quantum dynamics, it (it being a cowboy-carrot riding up your wall or whatever) is very very very (x10^very large number) improbable (as John Henry illustrated). And as CSflim demonstrated, most of quantum mechanics' weirdness and wakiness is elliminated on the every-day observable level by cancelation and other quantum mechanical effects.
The only thing I really have to add is there are indeed theories involving infinite universes with every possible universe (i.e. carrot cowboys) represented. However, it is only a theory and isn't one that could be readily tested. And as John Henry pointed out the odds of exisiting in one of these universes would be very tiny. So, I wouldn't worry about those cowboy carrots too much.
CSflim: What is wrong with waffling about the "wackiness" of it all? Quantum Mechanics is very weird and its equations allow for some odd-ball effects to happen.
For anyone interested in learning of the wackiness of all the modern-physics theories, I would recommend reading either book by Brian Greene. He just recengly released one, "The Fabric of the Cosmos" and I am knee-deep in it. It has been a few years since I read his "the Elegant Universe", and I don't really remember what is the difference between them. Anybody read these two books and can help me remember why anyone should read "the elegant Universe" as opposed to just getting a more or less updated version of the same thing called "The Fabric of the Cosmos"?
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