If the amount of damage the Hulk causes is based on how angry the Hulk gets and if the Animaniacs can not be defeated by the Hulk because of plot armor and Hulk comes back to life whenever he dies and there is no limit to how much the animaniacs can annoy someone if the animaniacs met the Hulk the Universe would be destroyed other than the Animaniacs and the Hulk who would be shown in front of a black screen with the universe being destroyed behind the black screen

That is my guess