The 'Concrete Slab' meme, better known as 'Return the Slab,' originates from the animated series Courage the Cowardly Dog, specifically the episode titled 'King Ramses' Curse.' In the episode, a CGI-rendered ghost of an ancient Egyptian pharaoh haunts the farmhouse after Eustace steals a stone slab for profit. The eerie, minimalist animation and the haunting chant of 'Return the slab, or suffer my curse' became a source of childhood trauma for many viewers, eventually evolving into a widespread internet legend. Today, it is commonly used as a reaction image to represent an intense demand for something to be returned or to parody the unsettling, uncanny valley nature of the original scene's animation.