It's Always Sunny in Philadelphia premiered on FX in 2005 and built long-running jokes around the gang's flaws, including Charlie Kelly's inability to read and write. That trait drives plots about misread signs, garbled notes and confidently wrong interpretations. Clips from the sitcom circulate widely as reaction audio because the performances sell embarrassment so clearly. This illiteracy moment fits that tradition, which is why editors reuse it for typos, failed captions and moments where someone has clearly not read the instructions at all.