The Klabautermann's benevolent behaviour lasts as long as the crew and captain treat the creature respectfully. A Klabautermann will not leave its ship until it is on the verge of sinking. To this end, superstitious sailors in the 19th century demanded that others pay the Klabautermann respect. Ellett has recorded one rumour that a crew even threw its captain overboard for denying the existence of the ship's Klabautermann. Heinrich Heine has reported that one captain created a place for his ship's Klabautermann in his cabin and that the captain offered the spirit the best food and drink he had to offer. Klabautermanns are easily angered. Their ire manifests in pranks such as tangling ropes and laughing at sailors who shirk their chores.