The line comes from Veruca Salt, the spoiled heiress in Willy Wonka and the Chocolate Factory from 1971, whose song I Want It Now turns a child's demand into a full musical tantrum. Clipped from that scene, the phrase travelled through meme pages and short video edits, where it became shorthand for entitlement and impatience. It endures because the demand is instantly recognisable even without the film, and because nearly every viewer has met, or been, someone who simply refuses to wait.