The 'Cast It Into the Fire' meme is derived from a pivotal scene in the 2001 film 'The Lord of the Rings: The Fellowship of the Ring.' During a flashback to the end of the Second Age, Lord Elrond brings Isildur to the Cracks of Doom to destroy the One Ring, shouting the legendary command 'Cast it into the fire! Destroy it!' Isildur, seduced by the Ring's power, simply replies 'No' and walks away. The meme gained massive popularity as a way to represent people refusing to give up something harmful, toxic, or obsolete, often used for comedic effect regarding bad habits, controversial opinions, or keeping items that should clearly be thrown away.