They're all the same base: alcohol

Oh, I remember what: my other bottle of champagne. –If you take that champagne back to Legal, you won't even get another swallow. –That's right. Maybe I'd better drink it right here. Join me, Peg? –Certainly. How does champagne go with Four Roses, Scotch, Martinis, and Bloody Marys? –Oh, fine. They're all the same base: alcohol.