Freemasons reportedly have a number of secret handshakes that they employ when meeting fellow travelers. Thumbs are pressed against knuckles or wrists in various permutations depending on the greeters' position within the society. Members of the Illuminati might be seen declaring their affiliation with hand signals that make them look suspiciously like classic rock fans. The Karstphanomen (the secret society in my new book, The Devil's Workshop) whisper Latin phrases to one another, conveying their mutual agreement that the "end justifies the means."