Answer:
I usually wear a yellow coat. I usually have a dark head. I make marks wherever I go.
Boxers do this for a living and kids do it in the backseat for free
When one does not know what it is, then it is something; but when one knows what it is, then it is nothing.
It's real until the trick is revealed.
The ball drops when the clock hits this.
I am a mother from a family of eight. I spin around all day despite my weight. Had a ninth sibling before founding out it was fake. What am I?