The Bart hitting Homer with a chair meme originates from the 1996 episode of The Simpsons titled 'A Milhouse Divided.' In the scene, Bart sneaks up on Homer while he is relaxing in a bathtub and smashes a folding chair over his back for no apparent reason. The image became a viral sensation as it perfectly captures the essence of a sudden, unprovoked action or a sneak attack. It is widely used across social media to illustrate one thing unexpectedly overwhelming another, often paired with text labels for humorous effect.