The line comes from The Simpsons, where Apu Nahasapeemapetilon, the cheerful owner of Springfield's Kwik-E-Mart, ends almost every sale with his trademark farewell. In the Latin American Spanish dub, the English 'Thank you, come again' became 'Gracias, vuelva prontos,' a phrase many viewers heard repeatedly while watching the show. Shared later as a short clip on soundboards and social video, it kept its meaning as a polite exit, which makes it instantly recognisable even to people who only know the character from memes.