When set loose, I fly away. Never so cursed, as when I go astray. What am I?

Answer: fart

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When you are inside me, you will be encouraged to slam other cars. What am I?
When you do not know what I am, then I am something. But when you know what I am, then I am nothing. What am I?
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When you take away the whole from me, there is always some left. What am I?
Where force can't get through, I with a gentle movement do. What am I?
Where there is light is the only place I can live. Yet if light shines on me I die. What am I?
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Whoever made me don’t want me. Whoever bought me don’t need me. Whoever use me don’t know me. What am I?
Whoever makes it, tells it not. Whoever takes it, knows it not. Whoever knows it, wants it not. What am I?
Whoever makes me, tells me not. Whoever takes me, knows me not. Whoever knows me, wants me not. What am I?
With a halo of water and a tongue of wood, stone as skin long I stood. What am I?