Funny Riddles

Question: 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?

Question: How Do You Make Chicken Napoleon?

Question: You can easily touch me, but not see me.
You can throw me out, but not away.

What am I?

Question: I have eight to spare and am covered with hair.

What am I?

Question: What goes in, down and out; but can't go in, up, out?