This sound is based on Joaquin Phoenix's portrayal of the Joker in the 2019 film Joker, directed by Todd Phillips. Clips of his distinctive laugh spread widely through meme edits, villain compilations and short reaction videos because the performance feels both theatrical and disturbing. Online, people use it to mark a descent into chaos, a twisted joke or a dramatic mental snap. It remains popular because the laugh is instantly recognizable even in a very short cut and communicates a lot of mood without any dialogue.