sinking a ball without having announced that you intended to sink it

I've mostly only played that rule for the eight ball. In the version wherein you have the low or high balls depending on the rack-breaking shot and must sink the eight ball (neither high nor low) to consumate your win (early sinking or the eight ball was an automatic loss) sinking the eight ball in any other than the pocket named also constituted a loss.

It just occurred to me that one who assigns the targets to individual gunners would also be said to "call the shots".