"The Last Rites of Jeff Myrtlebank" is episode 88 of the American television anthology series The Twilight Zone.
The townspeople believe that the man must be possessed by a "haint" (a ghost or demon), even though the town doctor declares it was more than likely a medical condition that imitated death; his heart stopped days prior after fighting influenza.
Jeff seems normal enough, yet he has changed: he has suddenly become a hard worker with exceptional strength, yet consistently eats less since his return.
They nervously accept the wisdom of this, and promise to attend Jeff and Comfort's wedding.
After the mob disperses, Comfort asks Jeff if he could really do the things he threatened them with, to which he replies that he was lying.