Answer:
What goes through a door but never goes in and never comes out?
An art-form and its colourful result.
How do you spell hard water with only three letters?
I'm often served as a "rack of ..." I'm often smoked or grilled, with bones in, and slathered in BBQ sauce.
A person's greatest asset.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.