What I Learned Today: Strange Sounds in the Sky

Do you hear what I hear? Or is it as fake as a flying plate?
Unidentified Audible Objects?
Electromagnetic Weapon?
Earth groaning?
Space craft?
The sounds of trumpets?
The Active Denial System?
Sasquatch's howl?
Governments drilling underground bomb shelters?
HAARP (High Frequency Active Auroral Research Program) research project on ionosphere?

http://www.nowpublic.com/strange/strange-sounds-heard-around-world-videos-and-theories-2882133.html
http://en.wikipedia.org/wiki/Active_Denial_System
http://en.wikipedia.org/wiki/Electromagnetic_weapon#Use_against_humans
http://www.darkgovernment.com/news/possible-explanations-for-strange-sounds/