Jeff Chen (Justin Chon), a boy with excellent grades, never does anything out of the ordinary. He is preparing for an entrance interview for medical school. The day before the interview was his 21st birthday. Instigated and persuaded by Jeff's two best friends, Casey (Skylar Astin) and Miller (Miles Teller), they meet in the flower world to celebrate Jeff's birthday and go crazy. However, they can't stop drinking once they start. The situation slowly gets out of control, crazy and terrible...