Just before dark on September 12, 1952, at Flatwoods, West Virginia, some young boys on a school playground saw a fiery UFO streak across the sky and apparently land on a nearby hilltop. Rushing to the site, and gathering a few others along the way, they saw a pulsating red light, encountered a nauseating mist, and turned a flashlight on a pair of shining eyes, revealing a huge creature. As it hissed and glided at them, the group panicked and fled. The next day investigators discovered skid marks and an oil-like substance that presumably came from the UFO.
To learn more about the mystery, see Joe Nickell's "Investigative Files" column in the November/December 2000 issue of Skeptical Inquirer.