Answer:
What flies forever, rests never?
What comes down but never back goes up?
What dentists battle on a daily basis
What goes up but never goes down?
A young man wants to have it, but when he has it he no longer wants it. Blade in hand he attacks it And does his best to remove it. Yet he knows that it is all in vain.
I am a room that has a roof but no walls. What am I?