Strange sounds all over the world. (compilation)

During January 2012, several people claim to have heard strange and loud noises coming from nowhere. This video shows a compilation of of several amazing footages from Youtube taken from people all over the world during January 2012.
Any rational explanations?

• #people_blogs
• #strange
• #weird
• #world
• #phenomena
• #scary
• #noises
• #sounds
• #unexplained
• #footage
• #2012
• #january