And suddenly he thought, I’m the abnormal one now. Normalcy was a majority concept, the standard of many and not the standard of just one man.
Abruptly that realization joined with what he saw on their faces–awe, fear, shrinking horror–and he knew that they were afraid of him. To them he was some terrible scourge they had never seen, a scourge even worse than the disease they had come to live with. He was an invisible specter who had left for evidence of his existence the bloodless bodies of their loved ones. And he understood what they felt and did not hate them. His right hand tightened on the tiny envelope of pills. So long as the end did not come with violence, so long as it did not have to be a butchery before their eyes.
Robert Neville looked out over the new people of the earth. He knew he did not belong to them; he knew that, like the vampires, he was anathema and black terror to be destroyed. And, abruptly, the concept came, amusing to him even in his pain.
A coughing chuckle filled his throat. He turned and leaned against the wall while he swallowed the pills. Full circle, he thought while the final lethargy crept into his limbs. Full circle. A new terror born in death, a new superstition entering the unassailable fortress of forever.
I am legend.
― Richard Matheson, I Am Legend and Other Stories