In Lyrics By Sting, the singer recounted when he used Shakespeare to appease a staggering drunk one night who kept demanding to know "How beautiful is the moon?" He answered with a line from Sonnet #130: "My mistress's eyes are nothing like the sun."
The inebriated man liked the answer and stumbled away into the night. Sting wrote: "Shakespeare is always useful, I've found, for calming down violent drunks, if only because it gives them the impression that you're crazier than they are."
This song, in particular, is "for the lunatics everywhere, for all those whose sanity is dependent on the phases of the moon."