Content: Latin Proverb
“Postquam vinum, lac. Fac testamento tuo.”

Transliteration –
“After the wine, milk. Make your will.”

Translation –
“If after wine, you drink milk, make your last will and testament.”

Context:
Informant – “I heard it from my father. He was quite the linguist. I’ve never heard anyone else say it, but the idea is that if you drink wine then milk, the milk will curdle in your stomach and you’ll feel very sick.”

Analysis:
Wine will curdle milk, so the proverb is factual. The fact that informant’s father told him the proverb in Latin heightens the humor. It’s a pretty silly, intentionally humorous quote and Latin is usually a very ostentatious language.