Answer:
What has no hands but might knock on your door, and if it does you better open up?
What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?
What runs around the whole yard without moving?
I have eighty-eight keys but cannot open a single door? What am I?
What goes up and down without moving?
It is something you will never see again.