As you might guess this is probably my favourite show (TVShow's header has an image of it).
Ted Mosby tells his kids how he met their mother (actually we don't know who she is yet), and for that he tells his living in New York when he was 30, with his friends, girlfriends, and whatever relevant he can talk about. His friends are Lilly, an artist from New York; Marshall, a big guy with a big heart who works with lawyers; Robin, a news reporter who cares too much about her job; and Barney, the funniest character. Nobody knows his job and he is always taking care of getting laid with girls no matter the price, like for example mesothelioma. Actually here's a video of Barney Stinson:
In this video Barney explains his new theory, the lemon law (taken from the automobile one), I hope you laugh with it and I recommend you to check more about this great show. Remember, the lemon law, it's gonna be a thing!