Answer:
What three letters change a boy into a man?
Curtail me thrice I am a youth; behead me once a snake; complete I'm often used in truth when certain steps you'd take.
What is the saddest fruit?
I can be swallowed, but I can also swallow you. What am I?
I am a box which holds keys but not locks. With the right combination, I may unlock your soul. What am I?
The answer I give is yes, but what I mean is no. What was the question?