The 'Mr. Brightside' meme originates from the 2003 debut single by the American rock band The Killers. Despite its age, the song has achieved legendary status as a perennial chart-topper and a cultural touchstone for Millennials and Gen Z alike. The meme typically centers on the song's opening lyrics, 'Coming out of my cage and I've been doing just fine,' often used to describe social anxiety, dramatic entrances, or the sheer ubiquity of the track at parties and weddings. Its usage ranges from simple lyric parodies to complex video edits that capture the chaotic, jealous energy of the protagonist, making it one of the most enduring musical memes in internet history.