Mary is a deceptive character that formulates a plan to embarrass Malvolio. "I will drop in his way some obscure epistles of love, wherein by the color of his beard, the shape of his leg, the manner of his gait, the expressure of his eye, forehead, and complexion, he shall find himself most feeling personated."
She is determined to "make him look like an ass."
"Observe him, for the love of mockery, for I know this letter will make a contemplative idiot of him."
"Here comes my noble gull catcher."