The line comes from The Lord of the Rings: The Fellowship of the Ring, released in 2001 and directed by Peter Jackson, adapting J.R.R. Tolkien's novel. Ian McKellen's Gandalf confronts the Balrog Durin's Bane in the Mines of Moria, and the shortened film wording became far more quoted than the book version. Clips and remixes spread through forums, YouTube and meme edits in the 2000s, turning a serious fantasy confrontation into a universal shorthand for refusing entry, holding ground or making a minor denial feel world-ending.