Well, this seems more reasonable than belief in the tenets of mainstream religion. The Huffington Post reports:
A HuffPost/YouGov poll shows that 45 percent of Americans believe in ghosts, or that the spirits of dead people can come back in certain places and situations.
The idea of ghosts as evidence of life after death goes back to ancient Egypt, where it was commonly believed that death was merely a transition to some mysterious netherworld of another existence. While skeptics deny the existence of ghosts, claiming there’s no real evidence, polls have shown the public strongly disagrees.
“There are still many hardcore scientists who regard it as superstition and a residual fear of our past,” said paranormal author Brad Steiger. “I put ghosts in what I call a psychic residue category. In environments where human drama has taken place — a murder, suffering — that emotional energy is somehow impressed in the environment.”