I am a little confused why subjunctive is used in this comic where Garfield says, "Eso hubiera sido un desastre." Is subjunctive used because Garfield is expressing an opinion? I wasn't expecting the subjunctive to be used as there wasn't the usual verb+que+subjunctive form. Is this one of those cases where there is subjunctive without a trigger phrase? Would the sentence still be correct if he had said, "Eso habría sido un desastre" or would the meaning have changed? Thanks!