The line comes from The Chronicles of Narnia: The Lion, the Witch and the Wardrobe, where Aslan confronts the White Witch over Edmund and the laws of the Deep Magic. C. S. Lewis published the novel in 1950, and the 2005 film adaptation gave the exchange its widely shared vocal delivery. Online, fans clipped the correction as a standalone quote, and it spread through fantasy forums, edits, and reaction posts as a shorthand for knowing the original rules better than the person invoking them.