The 'The Truth About Sans' or 'Sans Is Ness' meme stems from a 2016 video by MatPat on the YouTube channel Game Theory, where he proposed that Sans from Undertale is actually the character Ness from EarthBound. The theory was met with significant skepticism and playful mockery from the gaming community, quickly evolving into a meta-meme about outlandish fan theories and 'mind-blown' moments. Today, the template is used either to genuinely discuss video game lore or, more commonly, to present absurd, nonsensical connections between unrelated characters or franchises for comedic effect.