After a season of following God with faithfulness, Jonah entered into a dark time of discouragement and depression. At a moment when he should have rejoiced, we find the servant sulking!
From the sermon: The Sulking Servant (transcript available)

After a season of following God with faithfulness, Jonah entered into a dark time of discouragement and depression. At a moment when he should have rejoiced, we find the servant sulking!