Answer:
One more than a duet.
If you suffer from this, you might wear a wig
Sitting down you have it, Standing up you don't.
What can travel around the world while staying in a corner?
Casper was a friendly one and Demi Moore made a clay pot with one.
How did the phone propose to his girlfriend on Valentine's Day?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?