Answer:
What can't you see, hear or feel, until its too late. What shadows love, and shopkeepers hate?
What flies without wings? What passes all things? What mends all sorrow? What brings the morrow?
Gets rid of bad ones, short and tall. Tightens when used, one size fits all.
Until I am measured I am not known, Yet how you miss me when I have flown.
An open ended barrel, it is shaped like a hive. It is filled with the flesh, and the flesh is alive!
What did the piece of wood say when he saw the screwdriver and screws approaching?