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Here's one possible one for the Fridge Brilliance section of the 2015 Supergirl show: When Kara is trapped in the illusion that she is back on Krypton, she sees her parents, Kal-El and Astra, but no Non. Since we learn that Non unleased the Black Mercy on Kara behind Astra's back, perhaps this is a way of showing Kara that Astra isn't behind the illusion.
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How well does it match the trope?