The 'Duality of Man' meme finds its linguistic roots in the 1987 film Full Metal Jacket, where Private Joker references 'the Jungian thing' to explain the contradiction between his 'Born to Kill' helmet and his peace button. In internet culture, the phrase has evolved into a versatile template used to showcase irony, hypocrisy, or the wildly different personas people adopt in different settings. Whether it's a screenshot of two contradictory tweets side-by-side or a photo of a cat acting both elegant and absurd, the meme serves as a humorous commentary on the inconsistent and multi-faceted nature of human behavior and modern life.