One of the most entertaining ways to learn English today is by watching TV series and sitcoms. The episodes are not too long, usually are either pretty entertaining or simply funny, and tend to easily become part of your everyday routine and rest.
You can either just watch the series and relax or you could go a bit further and make use of the episodes that have actually been turned into lessons by various English teachers (see the link below), as well as take a Verbling Movie Course (check out my course fully based on movies and series, with video sessions and discussions)
Share with your ideas about how useful TV shows can be when learning a language. What's your favorite show? What would you recommend?