Gumbly, also widely known as Graggle Simpson, is a surreal internet hoax that emerged as a 'Mandela Effect' prank, claiming a strange, spindly yellow character was a core member of The Simpsons family since the beginning. Originally appearing on 2chan in 2017 as 'Nan-j-min' before being rebranded as Gumbly on 4chan, the meme gained massive traction in 2022 when social media users shared edited screenshots and clips gaslighting others into believing he was a real character. The meme represents a peak in internet 'weirdcore' and gaslighting humor, used to mock people's memory or create absurd alternate histories of pop culture through high-quality photo manipulation.