The Spongebob Magic meme, often referred to as the 'Imagination' meme, originates from the 2002 SpongeBob SquarePants episode titled 'Idiot Box.' In the scene, Spongebob explains to Squidward how he and Patrick can have fun with a simple cardboard box by using their imagination, while forming a shimmering rainbow with his hands. The internet adapted this moment as a versatile reaction image to sarcastically explain things away or to highlight something unbelievable. It remains a staple of meme culture for its colorful aesthetic and nostalgic appeal.