Billiards is very similar to snooker, except there are only three balls and no one watches it.

-Davis, Steve
  Quoted in Colin  Jarman The Guinness Dictionary of Sports Quotations (1990).

Up, all of us, and to Billiards.

-Pepys, Samuel
  Diary entry,17 Jul.

It was remarked to me by the late Mr Charles Roupell†that to play billiards well was a sign of an ill- spent youth.

-Spencer, Herbert
Quoted in Duncan Life and Letters of Spencer, ch.20. Robert Louis Stevenson has also been credited with this observation.