Tim Robinson is an American comedian and sketch performer whose deadpan delivery has made many of his lines popular as short reaction clips online. This particular phrase works because it is short, clear and instantly recognisable, even out of context, so editors can drop it into videos, streams and memes without needing to explain the joke. Its appeal has lasted because uncertainty is a universal moment in comedy and conversation, and a flat admission of not knowing often lands better than a loud punchline.