Introduction:Because Everyone is doing it and I feel peer pressured

[Owlix]

Welcome, Bob!

I can't answer your question about unexplained stuff, but here's some food for thought...

Ever get chills for no reason? Or suddenly just get a really really bad feeling?

Infrasound

Infrasound can give humans a feeling of unease or awe. It is thought that ambient ultrasound, sound too high to be detected by humans, may be the cause of certain ghost reports. It can even cause people to hallucinate grey figures. In experiments, as many as 1/5 subjects reported such feelings when exposed to ultrasound in a laboratory setting. At the right frequency, infrasound can make human organs vibrate, causing pain. For this reason, it has been a target of weapons research, and various prototypes have been fabricated and tested.

Thanks to David G McAfee on Facebook for mentioning the term..

[rexbeccarox]

Welcome, Bob!