Who knows what evil lurks in the hearts of men? The Shadow knows!
1. The famous saying of the crime-fighting vigilante,
The Shadow.2. The introduction from The Shadow
radio program "Who knows what evil lurks in the hearts of men? The Shadow knows!" spoken by actor Frank Readick Jr., has earned a place in the American idiom. These words were accompanied by an ominous laugh and a musical theme, Camille Saint-Saëns' Le Rouet d'Omphale ("Omphale's
Spinning Wheel", composed in 1872). At the end of each episode The Shadow reminded listeners that, "The weed of crime bears bitter fruit. Crime does not pay... The Shadow knows!"Source: 1. en.wikipedia.org/wiki/The_Shadow; 2.www.internationalhero.co.uk/s/shadpulp.htm