The rant comes from the It's Always Sunny in Philadelphia episode Sweet Dee Has a Heart Attack, first aired in 2008. Charlie Kelly, played by Charlie Day, works a mailroom job with Mac and becomes convinced that half the office does not exist, including Pepe Silvia and Carol in HR. Fans clipped the scene and turned the board into a template for any obsessive theory. It remains a shorthand online for overthinking, pattern hunting and explanations that collapse under their own string.