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PKShadikay777 2 points ago +2 / -0

The green slime AKA gunge orginally came from a show produced in Canada in 1979 called "You Can't Do That On Television". The then fledgling Nickelodeon network picked it up in 1981.

It was a sketch comedy show with a teenage cast. If one of the cast members said the words "I don't know" they ended up getting green slime dumped on their head.