Sirius thought he saw something out of the corner of his eye. Bugger, he'd been sure he'd been alone. In his prime, he'd been a charmer and a partier, but the unknown amount of time he spent in Azkaban had done a number on him and he was still trying to avoid being around people.
He didn't see anything when he looked however. That was strange. Wasn't that trash can a little further away? "Hullo?" he said in a clear British accent. "Is someone there?"