Answer:
The person who makes me doesn't need me. The person who buys me doesn't use me. The person who uses me doesn't know it. What am I?
What is black when you buy it red when you use it and gray when you throw it away?
I am higher than the king. What am I ?
I twist and turn and leave a loop. What am I?
I help engines spin and pants stay up.
When is it bad luck to see a black cat?