The clip comes from SMG4, the long running YouTube machinima series built around Mario and Nintendo parodies, and is lifted from Mario Reacts To Nintendo Memes 4. It riffs on the familiar YouTube notice shown when a video is blocked on copyright grounds by a rights holder, in this case Nintendo. Short excerpts like this spread on soundboards and in edits because the reference is instantly recognisable to gaming viewers, and creators reuse it as a punchline whenever a Nintendo joke goes too far.