Montresor leads Fortunato down to the Catacombs - feigning concern for Fortunato's health.
Luchresi knows not Sherry from Amontillado!
Yes, but your cough...
Fortunato grows tired of walking (his persistent cough not helping), but his want of the wine powers him on as Montresor's plan comes closer to fruition.
Where is the Amontillado?
Ah, it is only a little farther.
Montresor traps Fortunato behind a wall of bricks in the deepest part of the catacombs.
Yes, let us be gone.
"Ha! ha! ha! - he! he! he! - a very good joke, indeed - an excellent jest."
Now let us be gone, Montresor.
Montresor tricks Fortunato into following him to the catacombs to sample a cask of Amontillado because Montresor has grown tired of Fortunato mocking him.
Montresor continues to lead Fortunato deeper into the catacombs until they reach the end of it.
Fortunato realizes what is happening to him, but is unable to fight against Montresor in his drunken and hysterical state. This leads to Fortunato eventually dying from (possibly) starvation later on.