Apple of Discord
WordNet
noun
(1) (classical mythology) a golden apple thrown into a banquet of the gods by Eris (goddess of discord--who had not been invited); the apple had `for the fairest' written on it and Hera and Athena and Aphrodite all claimed it; when Paris (prince of Troy) awarded it to Aphrodite it began a chain of events that led to the Trojan War
WiktionaryText
Etymology
With reference to the golden apple in Greek mythology, inscribed ‘for the fairest female’, which sparked dissent among the gods and led to the judgment of Paris, and ultimately to the Trojan war.
Noun
- An object or topic which sows dissension and anger.