During the carnival in italy Montresor runs into Fortunato and offers to share a nice bottle of wine with him, however the wine is in the catacombs. It's late at night and Fortunato seems ill.
Montresor believes that Fortunato has "inflicted a thousand insults," on him. It is because of these "insults", which are not named in the story, that Montresor begins to execute his plot for revenge.
Montresor claims that he bought a large barrel of Amontillado and doubts