Tiffany Haddish is set to join Nicolas Cage for the action-comedy The Unbearable Weight of Massive Talent.The actress has signed on for the film, which also features Pedro Pascal and Sharon Horgan, in which Cage plays a version of himself.Directed by Tom Gormican, the production centers on a creatively unfulfilled Cage, who is facing financial difficulties and agrees to attend the birthday of a superfan, played by Pascal for $1 million.Haddish will portray a federal agent, who forces Cage to go