Portsbend Soup

Wandering Jack wandered from town to town with a stone and a bullshit story about how the stone was part of a recipe for the greatest soup in history.
He kept the scam going for years, convincing townsfolk to gather together and bring the actual ingredients for the soup.
Until Portsbend.
Everybody in Portsbend showed up with their own stones.
“No,” said Jack. “We need potatoes and corn and lettuce and beef bones and…”
“Well, why don’t you go get them yourself?” the townspeople said.
“That’s not how it works!” Jack shouted.
Jack fell screaming under a hail of stones.