Answer:
What is the difference between a poorly dressed man on a bike, and a well-dressed man on a unicycle?
I go around in circles, but always straight ahead. Never complain, no matter where I am led. What am I?
I cannot be bought, cannot be sold, even if I'm sometimes made of gold. What am I?
I have fangs and enjoy piecing holes with a single bite.
I am rarely touched but often held. If you are smart you'll use me well. What am I?
What language does a billboard speak?