A couple people here have suggested wet food to lure the cat down, but when mine found a spot abouve the cabinets that was much easier to get up than down that solution crossed my mind for only an instant before I realized it would probably only take one more go for him to realize there's a huge incentive to risking injury.

He would do this thing when he was angry where he would howl like a dog to make sure everyone within earshot understood the severity of whatever great injustice had taken place, and not taking him down when he wanted to be was definitely one of those cases. I'd give him maybe an hour to get his screaming in before getting around to helping him.