Answer:
My first half is normally made of stone, my second is crazy, and I taste sweet when complete.
I am nothing really at all, Yet I am easily foundอพ Ignore me at your own peril, and you might end up crowned!
Forward Iโm heavy, but backwards Iโm not.
You throw me out when you want to use me and you take me in when you don't want to use me. Who am I?
Only two backbones and thousands of ribs.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.