The song "That's" by Gilbert O'Sullivan is a playful and witty commentary on where the singer comes from and how he perceives the world around him. In the lyrics, the singer addresses the boys, telling them not to give him the same excuses and stories he has heard before. He mentions how he has encountered similar situations, either inside his overcoat or outside his door. The reference to a silver plaque in prussian blue signifies the insignificance of these repetitive experiences. The singer challenges the listener's understanding, suggesting that the answer lies in the play "A Midsummer Night's Dream" by William Shakespeare. By exploring the play, one can discover how his perspective and experiences originated. The lyrics further highlight the idea of multiplication and division, symbolizing the complexities of relationships and interactions. The lyrics playfully illustrate that dividing two from two results in nothing, indicating that sometimes dividing oneself from others can lead to emptiness. The singer alludes to a hypothetical scenario where someone may want to stay on his mother's kitchen floor. He states that there should be no reason for him to go out unless the person is underage, implying that he would not want to engage in inappropriate relationships. Overall, the song "That's" showcases Gilbert O'Sullivan's wit and clever wordplay to express his perspective on where he comes from and how he views the world.