How to Be (2008)

At first fancying himself an "enigmatic poet", twenty something Art gradually realizes that he must take action if he's going to escape his depressed life as a struggling musician in London. A solution comes in the shape of a book titled "It's Not Your Fault". Not content to just draw inspiration from its pages, however, Art invites the elderly author of the book to come live with him and his parents, which quickly becomes a painfully funny journey about dysfunction and growing up.