• Sure, that's what I mean,' Doc Daneeka said. 'A little grease is what makes this world go round. One hand washes the other. Know what I mean? You scratch my back, I'll scratch yours.' Yossarian knew what he meant. That's not what I meant,' Doc Daneeka said, as Yossarian began scratching his back.

    Joseph Heller (1999). “Catch-22: A Novel”, p.41, Simon and Schuster