Say, what's the proportion of gin and quinine water in this drink? Oh, I'd say about,...

Joan Howell: [becoming suspicious of an alcoholic drink Tom has made for her] Say, what's the proportion of gin and quinine water in this drink?
Tom Milford: Oh, I'd say about, uh... "even-Steven."
Joan Howell: [starting to giggle] I'd say it was more "Steven" than "even."