Answer:
I usually wear a yellow coat. I usually have a dark head. I make marks wherever I go.
What has a mouth but can't chew?
What is the freedom of birds and the pen of old men?
The man who invented it doesn't want it. The man who bought it doesn't need it. The man who needs it doesn't know it. What is it?
What can be filled with empty hands?
A cowboy rode into Friday. He stayed in town for three days and rode back on friday. How is that possible?