O filme é Primavera do Escorpião de 1995.
De acordo com este artigo de dezembro de 2016:
McConaughey followed up with a doozy of a story from his 1995 film Scorpion Spring.
"I had this idea that I need to go back like I did in my first film, where I just knew my man, and I would show up and just play the circumstances - improvise,” he explained.
“So I said, “I’m not going to read the script. Just tell me the character, tell me the situation, and I’ll show up, and I’ll just react and do what I would do.
“So I show up on set, we’re about to do the scene, and I said, “You know what? Since I know my man, let me just have a peek at these sides real quick.” I pick it up: four-page monologue … in Spanish.”
Parece que Matthew McConaughey não teve um problema em mencionar o filme e a história em outras entrevistas. Aqui está um trecho de uma entrevista de 2013 com o Hollywood Reporter, onde ele dá o nome de "The Hollywood Reporter" (em inglês). filme:
I go do this film, Scorpion Spring, and I got this idea: "I'm not gonna look at anything. I know what I am: the drug lord on the Mexican border in Texas. I'll just show up on the set, stay fresh and loose." Well, I get down there, OK, and I pick up this scene, and it's a page-and-a-half monologue in Spanish.