My circle of friends used to joke about the "Republican Test." You administer it like this: play the song "I Heard It Through the Grapevine," ideally the Marvin Gaye version, and ask the subject to "clap along with the music" however he or she feels.
Our unscientific observations showed a high correlation with 1/3 clapping and being old, square, uptight, or an alien from an unfunky and obsolete dying planet.