re: Perhaps you are not a PATHOLOGICAL skeptic.
I form this opinion from your reply where you state that:
No one can prove there is no Bigfoot, or that there are no UFOs. Perhaps they do exist, even scientists must concede they don't necessarily violate any known physical laws!
I take it then that you concede that UFO's don't necessarily violate any known physical laws.
Then your healthy skepticism stems from the fact that you do not have enough proof of their existence.
The question then is: What kind of proof would convince you that they can exist?