"Mr. Brightside" is a song by the American rock band The Killers, released in 2003 as part of their debut album, Hot Fuss. The song features a catchy melody and tells the story of a man who becomes jealous after suspecting his partner is unfaithful. Its themes of heartbreak and insecurity resonate with many listeners. The track gained significant popularity and has become one of The Killers' signature songs. It has been praised for its energetic sound and relatable lyrics, often played at parties and events. Over the years, "Mr. Brightside" has maintained a strong presence in popular culture, frequently appearing in various media.