Yesterday’s history. Tomorrow’s the future. Tonight’s the party.” Can’t Hardly Wait premiered in theaters 20 years ago with that tagline, although it could be applied to a number of similar movies about kids having one, momentous day that sets the course for the rest of their lives. In that 1998 film, those transformative experiences—all those hookups and breakups, the victories for noble losers and the comeuppances for unrepentant assholes—play out against the backdrop of one wild house party, a common trope for the 24-hour coming-of-age-movie. But whatever the individual setting, characters, or circumstances, the messages of these films is clear: When you’re young and not yet yoked to the responsibility and predictability of adulthood—and you still have the energy to go out—a single day can change everything. Here are 18 of them.