I'm going to tell you a story from the Vietnam war. Oliver Stone was serving as a Marine infantryman. He had a squad leader (whom the character Sgt. Barnes from the movie *Platoon* is based on) leading a patrol. Stone is green, and he is on point. They're creeping through the jungle, when suddenly the Sgt. grabs Stone from behind and signals for the platoon to halt, and that there are enemies directly ahead within a few meters. The Marines spread out and encircle this little ditch in front of them... and pull six Viet Cong fighters out of there. Stone said that if he had walked three more steps, he would've literally stepped on one of these fuckers- that's how well hidden they were. After the situation was dealt with, Stone asked the unnamed Sergeant how the fuck he spotted them. His reply: "I could smell them." Keep in mind this sergeant has been in the bush for over a year total. My point- I think that these "gut feelings" are manifestations of your subconscious mind picking up on threats and then desperately trying to signal your conscious mind by making you feel uneasy, queasy, jumpy, and paranoid. Perhaps you smell the scent of a dangerous animal- but our noses are not very good... consciously. Our sense of smell picks up an amazing amount of subconscious information. The guy in the video you provided might've been smelling scat or rotting carcasses. This puts him on edge, so when he hears a twig snap, in his mind it's not just a doe running by- **it's a fucking mountain lion moving in on him.** This is survival instinct. Instinct is poorly defined and not well understood. It's absolutely a thing. You can absolutely "feel" eyeballs on you. You can "feel" when someone is sizing you up for a fight. Slightly unrelated- shit like this is where the behavior of laughter likely originated. 150,000 years ago, before spoken language was developed beyond rudimentary grunts, your little tribe is getting ready to go to sleep for the night. But then you all hear a strange noise out in the darkness, a noise that you *shouldn't* be hearing. So a few of the men grab their spears and clubs, and stalk off into the darkness to investigate. They discover the source of the noise- a fox is eating a rodent! They lack the ability to verbalize "Hey guys, we got all spooked for nothing, it's just a fox!" So instead, they burst into laughter. It's amusing that everyone was spooked over something harmless. It's a way of reassuring the spooked tribe that all is well, we are safe, we are laughing! It feels good to laugh! Too bad I can't laugh anymore. I've lost the capacity on the account of the **SHEER, UNBRIDLED CYNICISM** that has overtaken me.