This is a generic everyday sound effect rather than a clip from a specific film, show or viral meme, so it has no single original source to trace. Phone typing sounds have become a common audio shorthand online for texting, chatting and digital communication, appearing in short videos, tutorials, skits and animations where showing a phone screen alone would feel silent. Because almost everyone recognises the rhythm of touchscreen taps, creators keep using it to make modern scenes feel immediate and believable without drawing attention away from the story.