well, there many sightings that cannot be denied.
this for example which is famous and cannot be denied because of many witnesses.
Surreal Sight:
It would be early morning on February 24, 1942 when the incoming craft sirens were first heard in the Los Angeles area. Many Americans were expecting another wave of Japanese fighter planes, and thought this is what they would see as they left their homes, and ventured outside. How wrong they were! The first sightings of a large UFO would be made in Culver City, and Santa Monica.
A Total Blackout:
Air Raid Wardens were ready to go at the first hint of an invasion. But, this invasion would be something other than Japanese planes. The giant hovering object was soon lit up by the gigantic spotlights of the Army's 37th Coast Artillery Brigade. Everyone who looked up was shocked by the sight of the giant UFO sitting above their city. Military aircraft were sent to confront the object.
UFO Takes Direct Hits:
Because of a well-organized alert system, the whole California southern section was searching the night skies in a matter of minutes. What they saw were beaming searchlights illuminating the night sky, all of them converging on one thing-a UFO. A similar scene would be repeated later during the The Norwood Searchlight Incident albeit, on a smaller scale. The beams of light would soon be accompanied by tracer fire from anti-aircraft artillery, all of the rounds aiming at the invading craft. The giant UFO would take direct hit after hit, yet without damage.
Hanging Magic Lantern:
The 37th Brigade was relentless in its attempt to bring down the large object, but found no success. The barrage of spent shells would fall over the entire area-no place was safe this night. Many were injured, and there were even reports of death from the falling shells. According to newspaper reports, eyewitnesses described the sight of the UFO like a "surreal, hanging, magic lantern."
continue reading here:
http://www.educatinghumanity.com/2012/02/ufo-battle-over-los-angeles-70th_24.html