The 'Hey, I've Seen This One!' meme originates from the 1985 sci-fi classic Back to the Future, where Marty McFly inadvertently reveals his time-traveling status by recognizing a TV episode in 1955 that hasn't aired yet. It gained significant traction on Reddit and social media around 2019 as a way to mock the lack of originality in modern media, such as Disney live-action remakes or repetitive movie sequels. The meme is typically used to point out historical cycles, internet reposts, or any situation where something supposedly 'new' feels suspiciously familiar to the observer, often paired with the confused response 'What do you mean? It's brand new.'