The sound comes from Charlie Bit My Finger, a home video uploaded to YouTube in 2007 showing Harry Davies and his younger brother Charlie. Originally shared with family, it quickly became one of the platform's earliest viral hits and was watched hundreds of millions of times. The clip's simple sibling moment was quoted, remixed and referenced across the internet for years, turning two ordinary brothers into early internet stars. Its lasting appeal lies in that unscripted innocence, which still feels fresh in short-form reaction videos today.