The phrase comes from Mexican political discourse, where demanding proof became a familiar refrain during Andrés Manuel López Obrador's presidency. The channel Personajes México built a following by impersonating public figures, and its AMLO impression turned the question into a repeatable punchline. Shared as a short clip, it travelled through political memes, reaction videos, and social posts, where it works as shorthand for scepticism. It endures because the demand is simple, recognisable, and easy to drop into almost any argument about unverified claims.