In literature, the initial incident is that which generates action in the protagonist. In the short story "The Cask of Amontillado" by Edgar Allan Poe, the unreliable narrator named Montresor mentions that Fortunato, whom he considers his antagonist, has committed a "thousand injuries" against him. Then, Montresor names the initial, or inciting, incident: "...when he ventured upon insult, I vowed revenge." Thus, the initial/inciting incident is the unknown "insult" that Montresor claims to have borne at the hands of Fortunato.
This insult spurs Montresor to find Fortunato among the Carnival revelers and put his plan of revenge into action, a plan which is predicated upon Fortunato's "weak point": He takes excessive pride in his connoisseurship in wine. Montresor capitalizes upon this pride of Fortunato's by flattering him: "I was silly enough to pay full Amontillado price without consulting you in the matter." Then, Montresor acts as though he will consult another man because Fortunato is too busy. But Fortunato's pride will not allow anyone else to be conducted to the catacombs of the Montresors where the Amontillado is stored. He tells Montresor "Luchesi cannot tell Amontillado from sherry."