Running on bones,  
I am shaking.  

Who or what am I?

Note:

I am visiting the Philippines now, and this is the direct translation of a popular local riddle spoken in Cebuano.


hint:

>!It is a simple riddle and definitely solvable.  The answer is not something scary or obscure.  It is a common thing. It is not a living thing.  It is manmade.