If you haven’t started watching Barry, an HBO show that started airing in 2018 and has two complete seasons with the third on the way, you should seriously watch it. But before you do, you should probably watch the trailer (below) to see what you’re in for – because it’s a doozy. The show stars Bill Hader, who is previously best known for his work on Saturday Night Live and lengthy roster of voice acting (Cloudy With A Chance of Meatballs, Angry Birds, Inside Out, Ralph Breaks the Internet), but more recently in the film It: Chapter Two. But Hader,…