"If you've picked up a newspaper in the past five or six years, yes," Sirius replied dryly. "And you must be really out of the loop if you don't even know what an Animagus is," he added, raising an eyebrow of his own. "It's a skill you've got to learn, unlike a Metamorphmagus. They can shapeshift from birth."

Sirius didn't really want to answer the last question, but he figured he owed it to the Doctor. "Azkaban. Wizarding Prison, located in on an island in the North Sea." He gave the Doctor a curious look. "You're muggle-born, aren't you?"