Answer:
What can you throw but not catch?
I am black when I am clean and white when I am dirty?
A hill full, a hole full; yet you cannot catch a bowl full. What is it?
Only two backbones and thousands of ribs.
What has a bell but isn't a church. Is full of air but is not a balloon?
What did the piece of wood say when he saw the screwdriver and screws approaching?