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The exact origin of this short RSD clip is not widely documented, so it circulates mainly as a standalone reaction sound on soundboards and in short form edits. Its appeal is the universality of the line itself, which needs no setup and is instantly understood in almost any language of memes. Creators reuse it for phone call jokes, mistaken identity gags and moments when a new person suddenly appears, and its one second length makes it easy to loop, layer or drop into a fast cut without explanation.
About this sound
A short voice clip of someone asking who is this, used as a confused reaction sound for unrecognised callers, strangers and unexpected messages online.
This is a brief spoken reaction clip built around the simple question who is this, delivered in a flat, puzzled tone. At just over a second long, it captures that moment of blank confusion when a face, voice or number appears without any context. There is no music or extra noise, just the clear line landing on its own. It works because the delivery feels genuinely caught off guard rather than performed, turning a normal question into a quick punchline for surprise, suspicion or playful disbelief in a video or chat.
