The Monkey's Paw

From the text:

“If you’ve had your three wishes it’s no good to you now then Morris,” said the old man at last. “What do you keep it for?”
The soldier shook his head. “Fancy I suppose,” he said slowly. “I did have some idea of selling it, but I don’t think I will. It has caused me enough trouble already. Besides, people won’t buy. They think it’s just a story, some of them; and those who do think anything of it want to try it first and pay me afterward.”