Answer:
What is the difference between a poorly dressed man on a bike, and a well-dressed man on a unicycle?
I am of several different kinds, but the one you pick doesn't do its job. What am I?
It flies around all day but never goes anywhere? What is it?
I can be cracked, made, told, and played. What am I?
I am two-faced but bear only one. I have no legs but travel widely. Men spill much blood over me. Kings leave their imprint on me. I have greatest power when given away yet lust for me keeps me locked away.
They come to witness the night without being called, a sailor's guide and a poet's tears. They are lost to the sight each day without the hand of a thief.