Sergeant Major Morris has a monkey's paw and tries to throw it in the fire, but Mr. White takes it and says that he will use it. "... don't blame me for what happens." Sergeant Major Morris says. He is foreshadowing that something bad is going to happen because of the paw.
The theme of The Monkey's Paw is that you should be happy with what you have and not be greedy for more. Mr. White begins by setting this example," I’ve got all I want". Then Herbert pushes him to wish for something, wanting more. Herbert later faces the consequences for being greedy.
The mood of the story is cautionary and serious. They wished for money, per Herbert's request and he died. Herbert was greedy and payed the price in a way that seemed as though it could have been a coincidence even though it wasn't. The text says that "He was caught in the machinery." This outcome cautions readers to be careful when making questionable decisions. The scene is sad and it shows this. Mrs. White is crying and it is dark out. These things match the mood and show that it is a sad, serious scene.