11B-X-1371, often referred to as the 'Plague Doctor Video,' first gained notoriety in 2015 when a disc containing the footage was sent to the Swedish tech blog GadgetZZ. The video features a figure in a plague doctor costume standing in a derelict building, surrounded by hidden codes, spectrogram imagery, and encrypted messages. Internet sleuths across Reddit and 4chan spent months decoding its contents, which included GPS coordinates and references to biological warfare. While later revealed as an art project by Parker Wright, the imagery remains a staple in the horror and mystery communities. As a meme, it is frequently used to represent unsettling vibes, 'cursed' content, or the feeling of stumbling upon something you weren't supposed to see.