Bonnie by Supertramp is a poignant song that explores themes of love, obsession, and longing. The song tells the story of an individual who is deeply infatuated with a woman named Bonnie. Despite the protagonist's intense feelings, there is a sense of unrequited love and a yearning for a relationship that may never fully materialize. The key themes revolve around the power of romantic obsession and the emotional turmoil it can cause. Poignant moments in the song include the vivid descriptions of Bonnie and the protagonist's inner conflict, as they grapple with their overwhelming emotions.