Sans is one of the most recognisable characters from Undertale, the indie role-playing game that became a huge online fandom after its release. Underfell is a fan-created alternate universe that reimagines its cast as harsher, more hostile versions of themselves, with Fell Sans as the universe's tougher take on the skeleton. Fans have reused his voice in animations, comics, dubs and meme edits for years, and later versions like this one aim to sound cleaner and closer to how the community imagines him. That shared fan shorthand keeps the clip useful for anyone making Underfell content today.