Sherlock Yack: Zoo-Detective Episode 2 - Who Knocked Out The Howler Monkey Episode Title:Who Knocked Out The Howler Monkey.Episode Description:Someone had enough of Howler Monkey playing his guitar and howling loudly, making the annoyed animal knock him out, resulting in a Howler Monkey that keep singing very nicely. As for Sherlock, he doesn't want to abandon his bagpipe, which was a gift from Ball of Purity but Hermione wants him to try some other kind of instruments. Ball of Purity's Lesson (Birthday): Instead of a lesson, Ball of Purity gives Sherlock a bagpipe.