An acorn-shaped UFO fell in the Kecksburg, PA area in 1965. This photo shows a mockup of the object, built for a 1990 episode of Unsolved Mysteries, which featured the case. More on the Kecksburg Incident here.
Professional paranormal investigator and feature columnist for Skeptical Inquirer science magazine, Joe Nickell, provided his skeptic's take on the paranormal. Nickell has investigated many so-called ghost sightings and experiences, and often is able to explain the anomalies in scientific terms. "What I'm trying to do with my work with ghosts [or bigfoot]... is to actually go and actually investigate... and provide the simplest and best scientific explanation for it," he said.