The phrase 'That's Just a Theory, A Game Theory' is the iconic sign-off popularized by Matthew Patrick, better known as MatPat, on his YouTube channel, Game Theory. Since its inception in 2011, the phrase has become synonymous with deep-dive lore analysis and over-thinking video game mechanics. In the world of memes, it is used to justify absurd leaps in logic or to conclude a series of increasingly frantic observations about fictional universes. Following MatPat's retirement from hosting in early 2024, the meme has evolved into a nostalgic tribute to a decade of internet theory culture, frequently paired with the channel's signature green logo and dramatic music.