The 'Say When' scene from the classic Western movie 'Tombstone,' featuring the iconic line delivered by Doc Holliday, played by Val Kilmer, has become a quintessential moment in film history. The character's calm yet confident demeanor contrasts with the impending violence, making the line memorable and versatile for various situations. It captures a moment of tension that perfectly encapsulates the spirit of the Wild West, where words can lead to life-or-death stakes.