Answer:
I have Eighty-eight keys but cannot open a single door.
I can sizzle like bacon. I am made from an egg. I have plenty of backbone but lack a good leg. I peel layers like onions but still remain whole. I can be long like a flagpole yet fit in a hole.
If you have me you want to share me. If you share me you don't have me. What am I?
What is seen in the middle of March and April that cannot be seen at the beginning or end of either month?
I am the kind of nut that is empty at the center and has no shell.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.