A velvet bag that is placed on the head of an unsuspecting victim and then struck with a wooden pole.
A velvet bag that is placed over the head of its unsuspecting victim, and then tied of with rope and then the person who has placed the bag on the head of the victim strikes the bag with a wooden pole.
“Would you like to see my new invention? It’s a starbag. I’ll place this on your head and then you’ll see stars”