Looking for the Title/Author of a Short Horror Story?

It’s a Good Life" is an episode of the American television anthology series The Twilight Zone.

Six-year-old Anthony Fremont looks like any other little boy, but looks are deceiving. He is a monster, a mutant with godlike mental powers. Early on, he isolated the small hamlet of Peaksville, Ohio. In fact, the handful of inhabitants do not even know if he destroyed the rest of the world or if it still exists. Anthony has also eliminated electricity, automobiles, and television signals. He controls the weather and what supplies can be found in the grocery store. Anthony creates and destroys as he pleases, and controls when the residents can watch the TV and what they cannot watch on it.

The adults tiptoe nervously around him, constantly telling him how everything he does is "good", since displeasing him can get them wished away "to the cornfield", where they are presumably met by a less-than-happy ending. Finally, at Dan Hollis' birthday party, Dan, slightly drunk, can no longer stand the strain and confronts the boy, calling him a monster and a murderer; while Anthony's anger grows, Dan begs the other adults to kill Anthony from behind---"Somebody end this, now!"---but everyone else is too afraid to act. Before he is killed, he is shown, indirectly by his shadow, transformed into a Jack-in-the-box. His widow breaks down, but no matter what happens, the people of Peaksville make sure to think only good thoughts and repeat "That's a real good thing that Anthony did!" and "It's a good life."

The original short story is "It's a Good Life" by Jerome Bixby. It used to be fairly frequently anthologized - I know that "The Science Fiction Hall of Fame Vol. I" has it.

And yes, it was adapted for the original Twilight Zone and for the movie.

mcdr is right, but I just didn't want to give a thumbs up. I wanted to reaffirm so you knew for sure. I saw it on The Twilight Zone movie, but it wouldn't surprise me at all if it did come from a TV episode first.