This post was created in regards to thinking you saw a BF but soon realized that it was a mis-identification. My "non" encounter that could of turned out very deadly (though I've witnessed a genuine BF once before) will be the basis for starting off this thread.
First off, I'm in the Norseman camp - BF, at least one BF, MUST be put on the slab! No ifs/buts/maybe's! After my initial sighting (I was unarmed) all forays moving forward had me a donning a Ruger 7mm Mag with a HUGE scope, with the purpose of bagging a BF to end this nonsense for once and for all. The Body will be donated to science but the head will go on my wall.
Last spring, I was searching a remote canyon on the Wasatch Front that was known to harbor BF, with many sightings reported in the past few years. About 20 minutes into my journey I spotted a hairy creature skulking behind some hillside bushes. Finally, I a gonna get'em! Through my scope, I watched this obvious bipedal"creature" crouching in in the brush, not moving much for sort of rocking back and forth on occasion, as if to get comfortable. It didn't appear as if it spotted me. I took the safety off the 7mm Mag and was about ready to send some lead into flight when something made me pause. I noticed that the "fur" was longer then what you'd expect with a BF plus was a splotchy coloration of drab green and browns. Then I saw a firearm (a shotgun) being held in the arms of this "thing"
WHOA!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! It was a Turkey Hunter camouflaged up in a Ghilly Suit!!!!!!!!! Obviously I flipped the safety back on and skedaddled out of there.
So, there's my mis-dentification and all's well that ends well, I guess. Tell me about that one (or more) time(s) where you were sure you're encountering a BF and it ended up being either nothing or something/somebody else