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Journalist Irwin M. "Fletch" Fletcher (Chevy Chase) begins investigating an airline executive from Utah in this popular '80s comedy. With the antagonist of the plot from Provo, Utah, the movie is full of LDS allusions and mentions, including a scene where Fletch dresses up as an airplane mechanic to gather information.
After Fletch mentions a plane looks well used, the following dialogue ensues:
Technician Willy: "Goes back and forth to Utah every weekend."
Fletch: "Oh is that right? What, is he a Mormon?"
[Other technicians laugh loudly]
Technician Bud: "I don't think he's doing a whole lot of singing with the Tabernacle Choir."
Disclaimer: The clip below contains a mild profanity. Watch at your own discretion.
Later, when showing some of his investigative evidence, Fletch shows a picture of the famous organ on Temple Square along with the Mormon Tabernacle Choir.