Give us a break wasn't bad, but the black ball question you hardly had time to think. There was a quiz machine in my local, late 80s, can't remember what it was called. But, you could select your own subject, music was my preferred choice, and the beauty was, if you played it long enough, the questions were duplicated.
Me and a mate of mine won that much, the machine was empty and wouldn't pay out, we had to ask the landlord for our winnings. The miserable bastard got rid of said machine soon afterwards.