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Laughing at oneself is a sign of humility.

Oh believe me, there's much to laugh at 

re: Humility

from the book Mystical City of God by Sr. Mary of Agreda, Volume II page 526 (The Mystical City of God by Ven. Mary of Agreda - Online Catholic Book (themostholyrosary.com)

CHAPTER XXL
THE LORD PREPARES THE MOST HOLY MARY FOR THE
FLIGHT INTO EGYPT; THE ANGEL SPEAKS TO SAINT
JOSEPH; AND OTHER MATTERS CONNECTED THERE
WITH.

INSTRUCTION WHICH THE QUEEN OF HEAVEN, MOST
HOLY MARY, GAVE ME.

617. My daughter, what thou must especially learn from this chapter is, that thou accustom thyself to humble thanksgiving for the benefits which thou receivest, since thou, among many generations, art so specially signalized by the riches of grace with which my Son and I visit thee without any merit of thine. I was wont to repeat many times this verse of David : What shall I render to the Lord for all the things that he hath rendered to me? (Ps. 115, 12). In such sentiments I humiliated myself to the dust, esteeming myself altogether useless among creatures. Therefore, if thou knowest what I did as Mother of God, consider what then is thy obligation, since thou must with so much truth confess thyself unworthy and undeserving of all thou receivest, and so poorly furnished for giving thanks and for making payment. Thou must supply thy insufficiency and thy misery by offering up to the eternal Father the living host of his onlybegotten Son, especially when thou receivest Him in the holy Sacrament and possessest Him within thee : for in this thou shouldst also imitate David, who, after asking the Lord what return he should make for all his benefits, answers : I will take the chalice of salvation; and I will call upon the name of the Lord (Ps. 115, 13). Thou must accept the salvation offered to thee and bring forth its fruits by the perfection of thy works, calling upon the name of the Lord, offering up his Onlybegotten. For He it is who gave the virtue of salvation, who merited it, who alone can be an adequate return for the blessings conferred upon the human race and upon thee especially. I have given Him human form in order that He might converse with men and become the property of each one. He conceals Himself under the appearances of bread and wine in order to accommodate Himself to the needs of each one, and that each one might consider Him as his personal property fit to offer to the eternal Father. In this way He furnishes to each one an oblation which no one could other wise offer, and the Most High rests satisfied with it, since there is not anything more acceptable nor anything more precious in the possession of creatures.

618. In addition to this offering is the resignation with which souls embrace and bear with equanimity and patience the labors and difficulties of mortal life. My most holy Son and I were eminent Masters in the practice of this doctrine. My Son began to teach it from the moment in which He was conceived in my womb. For already then He began to suffer, and as soon as He was born into the world He and I were banished by Herod into a desert, and his sufferings continued until He died on the Cross. I also labored to the end of my life, as thou wilt be informed more and more in the writing of this history. Since, therefore, We suffered so much for creatures and for their salvation, I desire thee to imitate Us in this conformity to the divine will as being his spouse and my daughter. Suffer with a magnanimous heart, and labor to increase the possessions of thy Lord and Master, namely, souls, which are so precious in his sight and which He has purchased with his life-blood. Never shouldst thou fly from labors, difficulties, bitterness and sorrows, if by any of them thou
canst gain a soul for the Lord, or if thou canst thereby induce it to leave the path of sin and enter the path of life. Let not the thought that thou art so useless and poor, or that thy desires and labor avail but little, discourage thee; since thou canst not know how the Lord will accept of them and in how far He shall consider Himself served thereby. At least thou shouldst wish to labor assiduously and eat no unearned bread in his house (Prov. 31, 27)