I was browsing youtube and I found the This Day Aria - Colt and Mare Duet

And I had a Thought:
Princess Cadence is kidnapped by Queen Chrysalis so she can take Shinning Armor.

King Metamorphosis replaces Shining Armor at the same time to control the Princess of Love.

Each assumes that the other is the real pony and the efforts they make to control their counterpart is a normal action they simply didn't notice before the switch.

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