What is it about Montresor that makes him an especially effective enemy to Fortunato? Give an example from another book, film, or TV show in which...

First, Montresor knows an ultimate weakness of Fortunato:

He had a weak pointthis Fortunatoalthough in other regards he was a man to be respected
and even feared. He prided himself on his connoisseurship in wine.

Montresor is thereby able to exploit this weakness in his plans to kill Fortunato while
also maintaining a keen ability in holding the man's trust:

It must be understood that neither by word nor deed had I given Fortunato cause to
doubt my good will. I continued, as was my wont, to smile in his face, and he did not perceive
that my smile now was at the thought of his immolation.

While Montresor plots to kill Fortunato by using personal knowledge against the man, he
is simultaneously able to never give himself away; Fortunato trusts him, and even as he is led
to what will become his tomb, he rejects Montresor's insincere attempts to turn back. Thus, he
allows himself to be led directly to his death.

In Shakespeare's
Julius Caesar , there is a similar betrayal. Brutus knows that...