The line comes from SpongeBob SquarePants, where exaggerated time cards mark absurd jumps forward in a story, and 'one eternity later' became the most extreme version of that gag. Clips of the narrator's delivery circulated widely as a meme sound on YouTube, TikTok and in video edits, because it could stand in for any long wait without extra explanation. Creators still reach for it today whenever a delay, a slow process or a dramatic transformation needs an instant, recognisable punchline.