"Did you know that there are hundreds of UFO sightings in 1 day. And they are not the flying saucers our governments found out how to make in WWII."

Crop circles used to be believed as true also, but was later found out it was down to man, "flying saucers" are just another thing which has come from the human mind, when someone believes they have seen a flying saucer, either the person is hoaxing the event or there is a perfect explanation to what the object realy is (none alien).