The line comes from Peter Jackson's The Lord of the Rings: The Fellowship of the Ring, released in 2001, during Gandalf and Frodo's conversation about the One Ring at Bag End. As a short isolated clip it later spread through meme edits, reaction videos and soundboards, where the original danger is played for comedy. People reuse Gandalf's refusal whenever a tiny offer is treated like a catastrophic temptation, and the contrast between the epic source and everyday situations keeps the joke easy to understand years later.