The 'One Does Not Simply Walk Into Mordor' meme originated from the 2001 film 'The Lord of the Rings: The Fellowship of the Ring.' During the Council of Elrond, Boromir (played by Sean Bean) uses this specific phrase and a memorable hand gesture to explain the impossibility of entering Sauron's realm. The phrase first gained traction on 4chan and Something Awful in the early 2000s before becoming a cornerstone of internet culture. It is primarily used to describe any task that is significantly more difficult than it appears or to mock people who underestimate a challenge. The template's versatility has allowed it to transcend its high-fantasy roots, becoming a universal shorthand for complexity and inevitable failure.