The line comes from The Lord of the Rings: The Two Towers from 2002, where Legolas realises the captured hobbits Merry and Pippin are being carried toward Saruman at Isengard. In the mid 2000s the moment was remixed online into a looping song, repeating the warning over an energetic electronic beat. The video spread widely as an early viral Lord of the Rings meme, and the chant survived long after because it works for any journey, quest or determined march in edits and streams today.