"Uno, dos, ultraviolento" (in English: One, two, ultraviolent) is a song by Argentine punk rock band Los Violadores, featured as a single from their Y ahora que pasa, eh? album from 1985. The song was Los Violadores breakthrough as one of the better known punk rock bands of Argentina. The lyrics are inspired in the novellaA Clockwork Orange. It was also covered in the 1990´s by former Chilean band "Los Prisioneros" member, Claudio Narea with great success in the country.