YMMV / Foster's Home for Imaginary Friends S3E5 "Imposter's Home for um...Make 'Em Up Pals"

• Captain Obvious Reveal: Goofball turning out to be an actual Imaginary Friend is a particularly bad example—the episode hammers in Frankie's suspicions that Goofball's actually human so much that eventually it becomes painfully obvious that she's going to turn out to be wrong, yet it still expects you to be surprised about it.