She was suddenly roused by the sound of the door-bell, and her spirits were a little fluttered by the idea of its being Colonel Fitzwilliam himself, who had once before called late in the evening, and might now come to inquire particularly after her. But this idea was soon banished, and her spirits were very differently affected, when, to her utter amazement, she saw Mr. Darcy walk into the room. In an hurried manner he immediately began an inquiry after her health, imputing his visit to a wish of hearing that she were better. She answered him with cold civility. He sat down for a few moments, and then getting up, walked about the room. Elizabeth was surprised, but said not a word. After a silence of several minutes, he came towards her in an agitated manner.

– Jane Austen

Pride and Prejudice, Chapter 34. Elizabeth is surprised by an unexpected visitor to the Hunsford parsonage, when an obviously nervous Mr. Darcy arrives to her door. After a little awkward and hurried small talk from him, which she responds to coldly but civilly, he walks around the room for a few minutes in silence. Then he walks agitatedly towards her and shocks her with what comes next – a most unexpected proposal of marriage!