Example 1: The original owner of the monkey's paw wishes for two unknown things but his last wish was death.
Example 2: The man wished for two hundred pounds and he got it but his son died.
Example 3: The major wanted to destroy the monkey's paw because he knew bad things would happen.
The theme of the story is, you shouldn't try to change fate. Fate is already chosen for you. Trying to change it can hurt you or others.