The line comes from King Ramses' Curse, a first season episode of Courage the Cowardly Dog that aired on Cartoon Network in 2000. In the story Eustace finds a stolen ancient slab and refuses to give it back for anything less than a fortune, so the ghost of King Ramses appears outside the farmhouse each night repeating his warning and sending plagues when ignored. The scene stuck with viewers for its stark animation and deadpan delivery, and clips later spread through YouTube reuploads and meme edits as a shorthand for greedy refusals.
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King Ramses delivers his eerie Return the slab or suffer my curse warning from Courage the Cowardly Dog, now used for spooky demands and meme threats.
The clip captures King Ramses, the gaunt undead pharaoh from Courage the Cowardly Dog, repeating his slow, echoing demand to return the slab or suffer his curse. His voice is deep, hollow and unnaturally calm, stretching each word over a faint desert wind and a low, ominous drone. Rather than sounding angry, he sounds patient and inevitable, which makes the threat feel creepier. Viewers instantly recognise the cadence from childhood, and that mix of nostalgia and dread turns an ordinary request in a video into a mock supernatural ultimatum that is hard to ignore.