I Love You, Beth Cooper (2009)

When Dennis Cooverman gives the commencement speech at his graduation, his friend tells him to let it all out. So he proclaims his love for Beth Cooper the head cheerleader, and reveals things about everyone in the graduating class as well as some other people. Later Beth confronts him and he invites her to a graduation party at his house. And to his surprise she and two of her friends show up. But also some of the people he offended with his speech. And one of them is Beth's boyfriend who she just broke up with. So they all get in Beth's car and drive away. And what follows is wild adventure.