The Curse of the Black Spot by a Siren-like creature who marks people with black spots on their palms after they are injured and appears to disintegrate them with her touch after putting them in a trance. Rory Williams receives a cut during a tussle with the pirates, and finds a black spot on his hand, but is prevented from succumbing to the song of the Siren by Amy Pond and the Doctor. Surmising the Siren is using water as a portal, the Doctor instructs the crew to seek refuge in the ship's dry magazine. There, they find Toby Avery, the son of the ship's captain
Carom billiards is thought to be traceable to 18th-century France. There is a large array of carom billiards disciplines. Some of the more prevalent today and historically are (chronologically by apparent date of development): "straight rail", "cushion caroms", "balkline", "three-cushion billiards" and "artistic billiards". There are many other carom billiards games, predominantly intermediary or offshoot games combining elements of those already listed, such as the "champion's game", an intermediary game between straight rail and balkline, as well as games which are hybrids of carom billiards and pocket billiards, such as "American four-ball billiards", and "cowboy pool". "English billiards" played on a snooker