Question: are the ring and the grudge connected?
Answer: The Ghosts From 'The Ring' and 'The Grudge' Are Teaming Up For a Crossover Sequel. How many movies began their existence as an April Fools' joke? ... Kayako is the ghost from The Grudge series. Per Variety, a Freddy Versus Jason-style rumble between the two was initially conceived only as an April Fools' Day prank.