Answer:
If you have me, you want to share me. Once you share me, you won't have me. What am I?
Drop me and the world will shatter. You can always find me where you empty your bladder.
Tear me off and scratch my head, what once was red is black instead. What am I?
I am what no man ever yet did see, which never was, but always is to be. What am I?
If you drop me I'm sure to crack. But give me a smile and I'll always smile back.
Brings the sky a lot closer.