For the "Cask of the Amontillado" the theme topic is betrayal. The reason is while Fortunato played many jokes on his friend Montresor he saw nothing wrong with his friend until he was lured into the wine cellar and shackled to a wall by his own friend. The betrayal of this story if how Montresor ends up killing his friend after being pranked by him over and over again. Sorry I didn't read the other one :(
