The Sans Undertale vs. Arataka Reigen meme commemorates the legendary final round of the 2022 Tumblr Sexyman bracket on Twitter. This cultural phenomenon pitted the iconic pun-loving skeleton from Undertale against the charismatic 'psychic' mentor from Mob Psycho 100 in a battle for supreme internet popularity. The showdown reached fever pitch when Reigen defeated Sans by a mere 0.1% margin, an event that coincided surrealistically with the announcement of Queen Elizabeth II's death. Today, the template is used to represent high-stakes rivalries, improbable outcomes, or the chaotic energy of internet fandom competitions.