A few days ago we were dicussing the accidental meeting of Darcy with Wickham in Meryton and the passions it seemed to promote,in Chapter 15:

Mr. Darcy corroborated it with a bow, and was beginning to determine not to fix his eyes on Elizabeth, when they were suddenly arrested by the sight of the stranger, and Elizabeth, happening to see the countenance of both as they looked at each other, was all astonishment at the effect of the meeting. Both changed colour; one looked white, the other red. Mr. Wickham, after a few moments, touched his hat -- a salutation which Mr. Darcy just deigned to return. What could be the meaning of it? -- It was impossible to imagine; it was impossible not to long to know.

Some discussion took place,and I've linked the relevant thread here.

In the infamous proposal scene in Chapter 34,we have Mr Darcy reacting with anger,as thus:

Mr. Darcy, who was leaning against the mantlepiece with his eyes fixed on her face, seemed to catch her words with no less resentment than surprise. His complexion became pale with anger, and the disturbance of his mind was visible in every feature. He was struggling for the appearance of composure, and would not open his lips till he believed himself to have attained it.