The exact source of this broken leg clip is not clear from the available information, so it is best treated as a general injury sound effect used across short-form edits and meme videos. Sounds like this spread because they instantly communicate pain, danger or awkward physical comedy without needing context. Creators keep using them in fails, stunt clips and reaction posts because a very short snap effect can make a visual moment feel harsher, funnier or more wince-inducing in a single beat.