The clip comes from 'Prejudice', a rapid-fire comedy song by Australian musician and comedian Tim Minchin, featured on his 2010 live album Ready for This? Built as a tongue-twisting list of stereotypes set to piano, the track became one of Minchin's signature numbers and a staple of his stand-up concerts. Short vocal fragments like this one later escaped into meme soundboards, where the 'ninja sneak ninja' line found a new life as a stealth-moment cue. Its rhythm and silly confidence make it instantly reusable, which is why it keeps popping up in sneaky edits years later.