Strange sounds all over the world..

[Cosmo D]

Ok, most of you have probably heard of this, and made up your own theories. I'm getting freaked out by this though
 
<a href="http://www.youtube.com/watch?v=vcUDYBIrWio" target="_blank">http://www.youtube.com/watch?v=vcUDYBIrWio</a>
 
<a href="http://www.youtube.com/watch?v=ThjG0fIuhVM" target="_blank">http://www.youtube.com/watch?v=ThjG0fIuhVM</a>
 
<a href="http://www.youtube.com/watch?v=hed2ra0cC3o" target="_blank">http://www.youtube.com/watch?v=hed2ra0cC3o</a>

<a href="http://www.youtube.com/watch?v=WHug-BSb7fw" target="_blank">http://www.youtube.com/watch?v=WHug-BSb7fw</a>

The 2 last ones scares me most, since it's here in Norway...

[Johnny A]

1st one is Godzilla in the background
2nd is honey badgers
3rd sounds totally faked
4th the camera annoys the tits out of me

[oversee]

One time in a hotel, I heard a very low droning noise, so low you almost couldn't hear it but you could feel it like when someone is playing their bass too loud.
Not sure what it was, but I read about a communication system that the navy uses to communicate with submarines that uses very low frequencies, and it could have been that.