Doraemon (1979)

The Lying Mirror (1x123)

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Nobita finds a mirror in his room left by Doraemon. Nobita sees how beautiful he looks, but is told by Doraemon that it is a lying mirror. The mirror is able to convince everyone to change their current facial expression to look more 'beautiful'. It has a malicious streak and convinces Nobita he is handsome when he pulls an ugly face.