The fact you even think that's a fair analogy shows how much you need to balance out your thinking/attitude about metaphysical speculation and your philosophy on the nature of reality. The scientific aspects of observation and what can be "put under a microscope" only deals with repeatable physical laws that the universe generally (possibly, if you postulate the existence of a 'God' or the supernatural then a 'miracle' is possible in that world-view) runs on. Now, because a belief in bigfoot does deal with what's supposedly in the physical realm, then your analogy is actually quite fair, I was just commenting on the idea of anything spiritual/metaphysical/supernatural, etc. Remember, the word supernatural does not mean against nature but above nature (real key point there actually).