In "Percy Jackson's Greek Gods" by Rick Riordan, the character Ares exhibits an unusual phobia—he has developed a serious fear of jars. This peculiar fear adds a humorous twist to his otherwise fierce persona as the god of war. It highlights how even powerful figures can have vulnerabilities that seem trivial at first glance.

The narrator of the story finds amusement in Ares' fear and jokingly considers gifting him a jar for Christmas. This playful idea reflects the light-hearted storytelling style Riordan employs while exploring themes of mythology and character traits, making the gods more relatable and entertaining for readers.