This High Holiday season I have been reading a book on “hanhagot,” or acts of personal piety. So far, this is the best I have encountered:
Once, Rebbe Zusya visited the holy genius, Rabbi Mordecai, who gave him a room for the night. After midnight, Rabbi Mordecai heard how Rebbe Zusya woke up and jumped around the room. After doing this for a while he called out, “Master of the World, I love You! What can I do for You? I can’t do anything!” Then he… repeated the same thing a number of times… [and]… ran around the room until he said, “I know what I can do! I can whistle for you!” He began to whistle with such fervor that Rabbi Mordecai said to his comrade who was standing near him, “Let us leave here quickly before we get burned by the breath of his holy mouth.” ----from Ohel Elimelech.