Set against the placid harbor of Havana, it depicts an event that took place in 1749 when a 14-year-old orphan was attacked while swimming alone.  
Valentine Greene's 1779 mezzotint popularized this painting.  Infrared reflectography has revealed that the artist originally intended to add another young man where the balding sailor in the beige coat appears in the final work.  While men in gray remain firmly within the craft, two men in white stretch forward and a man in a black coat thrusts a harpoon at one of the title figures.  Set against the placid harbor of Havana, it depicts an event that took place in 1749 when a 14-year-old orphan was attacked while swimming alone.  For 10 points - name this Copley painting of a man losing his leg to an animal.
Valentine Greene's 1779 mezzotint popularized this painting.  
Watson and the Shark