The 'Knee Thing' meme refers to a specific, often unspoken physical gesture in relationships or interactions that became a viral sensation across social media platforms like TikTok and Twitter. Initially surfacing as a discussion about subtle physical chemistry—specifically how someone might position their knee during a close interaction or hug—the concept quickly transformed into a versatile reaction template. Often paired with images of Andrew Garfield’s Spider-Man or other expressive characters, the meme perfectly captures the intense realization or appreciation of a partner's specific 'move.' It has since evolved into a shorthand for high-chemistry moments, used by creators to highlight those small, niche actions that carry significant emotional or romantic weight.