CLEVELAND -- Do you believe in UFOs or crop circles?

The movie "Signs" explores the mystery of crop circles and the existence of something else out-of-this world.

John Timmerman, of the J. Allen Hynek Center for UFO Studies, said the facts are real.

"The few that I've come across (have been) audiotaped (and) are nothing compared to the mass of information that is emerging worldwide to others like myself, and others telling of events that defy easy explanation," Timmerman said.

An Ohio social worker, Mary Lynne Zahler, said she saw something one summer night.

"People have said, 'Maybe you were drinking,' but I know that's not the case, because I didn't drink," she said. "I only drank water because I was the driver."

Zahler, a Miami University graduate, was driving home one night with a friend when she witnessed something she can't explain.

She said it seemed to come out of the darkness.

"When we made a turn onto their street, it just, like, took off," she said. "It had been hovering like a blimp, but no noise, but then, all of a sudden, it just took off and disappeared."

She said it really scared her and her friend.

WEWS said it isn't UFO investigators' job to separate fact from fiction.

Those who follow the very methodical and careful scientific-based steps in UFO investigation say some cases simply are inexplicable, but it is what the mystery suggests that is exciting.

"When there's this mark on the ground -- physical tracings -- can't say they're all nuts and psychics or using illegal drugs," said Richard T. Lee of Mutual UFO Network.

Lee and his wife, Kathy, belong to MUFO. Their work spans decades, trying to bring meaning to a mystery.

Lau reported that Ohio is among the most reported areas for UFO sightings, including crop circles. Some turn out to be hoaxes, but there is still that small 1 or 2 percent that cannot be explained.

When there is a report, the Lees collect samples, evidence and reports.

"Scientifically, we also take a control sample, outside of the area. If there is photographic evidence, you do frame-by-frame analysis of evidence."

It was Dec. 27, 2000 when Stan Romanuk was trying out his new video camera outside Denver when he suddenly saw shapes in the sky. Others saw it too, and he managed to capture it on video, Lau said.

Was it a hoax or was it something else? No one can say for sure.

Lau said the question leads back to Zahler, who is married with a successful career.

She said she witnessed something she still can't explain to this day. She said she hasn't shared her story freely because she's been afraid of what others may think.