Creepy Sound from the sky?

This morning i read the scary news about the strange noise from the sky in Sarawak.
http://www.brudirect.com/index.php/The-Borneo-Post/rumble-in-the-sky-over-samarahan.html

Then i try to search from the google and try to hear what so creepy about the sound, then i found another blog.
http://www.homorazzi.com/article/strange-noises-video-2012-alberta-manitoba-costa-rica-theories-scary-noises/

So strange noise, Don't have a clue since it can be heard all around the world.