The jolly roger flag was flown by pirate ships to instill fear in their victims to encourage them to surrender without a fight. One can only imagine the fear and madness that would follow when faced with the great Cthulhu! A Jolly Roger version of Cthulhu, that's anything but jolly. Printed in Khaki ink on the back of a quality cotton/poly work shirt, with a smaller version above the front left pocket.