Alongside Superbad in terms of popularity, Step Brothers is another beloved comedy to emerge out of the late 2000s. 40-something adults Brennan (Will Ferrell) and Dale (John C. Reilly) both live at home with their single parents. In a twist of fate, Brennan's mom and Dale's dad fall in love and get married, forcing the two to live under the same roof. Despite their age, they both act like teenagers. Their step-sibling rivalry is real, which causes many conflicts in the house. The film tackles the often complicated nature of blended families along with the societal pressures of growing up, being relevant to both teenagers and young adults alike.