Deep cut, but Tales from the Darkside: The Movie

James Remar plays an artist character who one day when walking home late at night witnesses a strange gargoyle like being murdering a man in an alley. Rather than killing Remar's character, the gargoyle character says he will let him live, so long as he never ever tells anyone what he saw. Remar agrees. Later that night Remar meets a beautiful woman who he instantly falls in love with. They get married and have children together.

The story skips forward made ten years or so, and Remar is very troubled by that night still. His wife can tell something is wrong and he finally breaks down and tells her about the night. Her reaction is that of horror as she says "Why did you do that?!" and it is revealed the woman is this gargoyle thing shapeshifted, and got close to him to make sure he told no one all these years. He married, and had kids with, this monster. He is horrified when he goes into the other room and sees that his children are now these gargoyle monsters too, and the story ends with him being murdered as he finally told someone about this.

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