Madame Loisel thought she deserved to be rich and beautiful, so she borrowed a Diamond necklace from her best friend for her husband's upcoming ball. She lost it, and it took her 10 Years to pay it off only to find it was fake.
The Possibility of Evil
Montresor seeks revenge on Fortunato, and lures him to the wine cellars bribing him with the idea of a rare wine. He gets him drunk, and walls him up into the cellar, never to escape.
Lamb to the Slaughter
Everyone draws paper to find a winner, most don't remember that the winner is stoned to death hoping for better crops.
The Most Dangerous Game
Miss Strangeworth believes herself to be a kind of guardian of her town, She identifies a potential evil. She dropped one of her letters at the post office, and the next day all of her roses were killed.
Mary Maloney was waiting for her husband, and kills him after her husband's unexpected announcement that he's leaving her when she's pregnant, Mary kills him with a leg of the lamb, and fed it to the police when they came for the murder.
On a yacht, Rainsford goes to smoke his pipe on the deck at night. He hears gunshots making him fall into the water. He paddles to the shore, and finds a house which he gets invited in. They eat and talk, when he starts being hunted, jumping off a cliff to live.