The exact origin of this clip is not documented, so it circulates online mainly as a generic meme reaction rather than a quote tied to a known character or show. Short complaint sounds like this spread through soundboards and short video edits because they are instantly understood without context. The plural search phrasing around knees hurting shows people use it for broader aches and aging jokes, while this version keeps the focus on a single knee. It remains popular for quick, low effort punchlines about exercise, stairs, sports mishaps, and everyday stiffness.