My favorite scene was where Kirk had the State dinner with Gorkon and everyone got a little tipsy.
Romulan ale was a highly intoxicating alcoholic drink of Romulan origin with a characteristic blue color.
It was also used for “medicinal purposes” (Really? Now you tell me)
Captain James T. Kirk: [dictating his personal log] The Enterprise hosted Chancellor Gorkon and company to dinner last night. Our manners weren’t exactly Emily Post. Note to the Galley; Romulan Ale can no longer be served at diplomatic functions.