Here's why:
* Allusion: A reference to a well-known person, place, event, literary work, or work of art.
In this case, the phrase alludes to Shakespeare's play *King Lear*. In the play, King Lear asks Gloucester, "Didst thou not see her paddle with the palm of her hand, and then did she not strike her in the face?" Gloucester responds, "I have seen her, madam, as you commanded me; but I know not what to say. I will not speak of her; for she is out of my sight." Lear then says, "My wits begin to turn. Come, unbutton here." Gloucester says, "I pray, sir, be patient. It is the infirmities of age. This heat will make you mad. I pray, sir, be patient." Lear, in his madness, then says, "O, let me not be mad, nor yet mischance me in the way of truth. Thou canst not say I did it. Never shake thy gory locks at me." Gloucester says, "I know not what you mean." Lear then says, "To thee, old man, my hands are full of blessing. I shall be loved when I am lack'd. Nay, come, let's go. I am cold of comfort, and for this, I weep. At thy good heart's oppression. But I will not, I will not." Lear then says, "Come, let's go. These are the slings and arrows of outrageous fortune, and I will not be a victim. I will not. I will not. I will not." Lear then says, "Come, let's go. This is the thing that makes me mad." Gloucester says, "I know not what you mean." Lear then says, "It is the root of madness, this thing that makes me mad. This thing that makes me mad. This thing that makes me mad. This thing that makes me mad. This thing that makes me mad. This thing that makes me mad. This thing that makes me mad. This thing that makes me mad. This thing that makes me mad. This thing that makes me mad. This thing that makes me mad. This thing that makes me mad. This thing that makes me mad. This thing that makes me mad. This thing that makes me mad. This thing that makes me mad. This thing that makes me mad. This thing that makes me mad. This thing that makes me mad. This thing that makes me mad. This thing that makes me mad. This thing that makes me mad. 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