The exact source of this 'but you told me' clip is not documented, and it circulates online as a standalone reaction sound rather than as a quoted movie line. Its popularity comes from the phrase itself: a compact, confrontational way to flag a contradiction, which makes it endlessly reusable across prank videos, reaction content and argument compilations. Creators pair it with split-screen evidence — the denial on one side, the original promise on the other — and drop it at the moment the contradiction is exposed.