Tales from the Darkside - Season 4 - Eps 18: Hush
A babysitter is called in to take care of a sick boy. As a game, the two make up a pretend creature out of household parts, one that eats sounds. The creature comes to life, sucking the sound and the life out of everything in the house. The two try to evade it, but the boy's uncontrollable coughing gives him away. The creature then becomes sensitive enough to the girl's heartbeat to find and kill her too, then goes out into the world for more "food"".
About Tales from the Darkside

Title: Tales from the Darkside
First Air Date: 1984-09-30
Last Air Date: 1988-07-23
Status: Ended
Rating: 7.2/10 (from 79 votes)
Language: EN
Seasons: 5
Total Episodes: 89
Network: Syndication
Genres: Drama, Sci-Fi & Fantasy
Production Companies: JayGee Productions, Laurel Productions, Tribune Entertainment
Synopsis
Tales from the Darkside is an anthology horror TV series created by George A. Romero, each episode was an individual short story that ended with a plot twist. The series' episodes spanned the genres of horror, science fiction, and fantasy, and some episodes featured elements of black comedy or more lighthearted themes.
Cast

Paul Sparer
Narrator (voice)