A woman. Alive. In the daylight.
He stood, mouth partly open, gaping at the woman. She was young, he could see now as she came closer; probably in her twenties. She wore a wrinkled and dirty white dress. She was very tan, her hair was red. In the dead silence of the afternoon Neville thought he heard the crunch of her shoes in the long grass.
I've gone mad. The words presented themselves abruptly. He felt less shock at that possibility than he did at the notion that she was real. He had, in fact, been vaguely preparing himself for just such a delusion. It seemed feasible. The man who died of thirst saw mirages of lakes. Why shouldn't a man who thirsted for companionship see a woman walking in the sun?

Ch. 15 - I Am Legend (1954)