Sans is the breakout star of the 2015 indie RPG Undertale, created by Toby Fox. While initially appearing as a lazy, pun-loving skeleton, he became a massive internet phenomenon due to his complex character arc and the incredibly difficult 'Genocide Route' boss fight. The 'You’re gonna have a bad time' line and the first few notes of his theme, 'Megalovania,' became instant shorthand for impending doom or unexpected consequences in internet culture. Sans memes range from surreal 'cursed' edits to meta-commentary on gaming, solidifying his place as one of the most recognizable figures in modern digital folklore.