Paint Your Wagon
Image from fanmovie.cz
In this unexpected Western musical comedy, a new character appears in town who is quickly subjected to an interrogation, during which the people realize they are undoubtedly talking to a Mormon:
"Just where are you people from"
"Illinois originally. I'm Jacob Woodling. This is my wife Sarah."
"And who might this fine young woman be?"
"Her name is Elizabeth Woodling."
"No, my wife."
[Shocked reactions] "Your wife? I thought that one was your wife."
"They both are."
"Holy Moses, the Mormons!"
Later, these characters reappear in the plot, along with a mention of Brigham Young that's not entirely historically accurate.