The 'That's Forbidden Love' meme serves as a versatile reaction image used to express shock, feigned outrage, or amusement at unconventional pairings. While it often stems from dramatic anime tropes or sitcom scenes where a character hyperbolically calls out a taboo relationship, the internet has repurposed it for everything from food crimes like pineapple on pizza to weird software integrations. It captures the essence of shipping culture while adding a layer of ironic judgment, making it a favorite for fandoms and social media users who want to mock bizarre crossovers or 'unholy' combinations of ideas.