She'd call him gringo*, he said, never John.
One night, he was woken up by her shaking him, "John! John! Wake up, John!"
He said, "I knew I was in trouble when she started calling me John."
Sure enough, she's just had a dream in which he was kissing another woman, and was very angry with him.
*gringo | ˈɡrɪŋɡəʊ | noun (plural gringos) informal (in Spanish-speaking countries and contexts, chiefly in the Americas) a person, especially an American, who is not Hispanic or Latino. ORIGIN Spanish, literally ‘foreign, foreigner, or gibberish’.