"I think we'll take it""Okay, but make sure you don't make any silly wishes"
"The Monkey's Paw" starts off on a cold and wet night at the Parlor of Laburnam Villa. The Whites (a family of three) were waiting on a guest that had a special surprise for them.
Sergeant Morris arrives and they find out about the Paw and keep it. That night the White family wishes for 200 pounds to pay their house off. Following morning Hebert (the son) goes to work and gets caught in a piece of machinery. He dies and Maw & Meggins pays the family back in 200 pounds of compensation. Then Mrs. White realizes there are 2 wishes still on the paw and wishes for Herbert to come back.
After Mrs. White wishes for her son back they hear a knocking at the door. The knocking continues for a little longer.
Be happy with what you have
Mrs. White rushes to the door and Mr. White grabs the paw and wishes upon it. The knocking stopped, Mrs. white opens the door and no one was there.
We can assume when Mr. White grabbed the paw to wish upon it he wished for their son to stay dead forever and this would have caused the knocking to stop.
The conflict is man vs. supernatural, the mystic object is the monkey's paw and theme is to be careful of what you wish for or be happy with what you have.