Here are some great Alien / UFO quotes to show to non-believers:

NOTE: If you know for a fact that any one of my quotes are not valid, let me know by replying with the quote and the reason why.

"After the plane from Roswell arrived with the material I asked the base commander to personally transport it in a B-26 to Major General McMullen in Washington DC. The entire operation was conducted under strictest secrecy. The weather balloon explanation for the material was a cover story to divert the attention of the press." - Brigadier General Thomas Dubose - Commanding Officer of Wright Patterson Air Force Base - Affadavit 09/16/01
"All Apollo and Gemini flights were followed, both at a distance and sometimes also quite closely, by space vehicles of extraterrestrial origin - flying saucers, or UFOs, if you want to call them by that name."
"At no time, when the astronauts were in space were they alone: there was a constant surveillance by UFOs." - NASA Astronaut Scott Carpenter, Carpenter photographed a UFO while in orbit on May 24, 1962. NASA still has not released the photograph.
"Blue Book was now under direct orders to debunk...I remember the conversations around the conference table in which it was suggested that Walt Disney or some other educational cartoon producer be enlisted in the debunking process." - Dr. J Allen Hyneck - Scientific Consultant to Blue Book
"Every time it occurred, the astronauts informed Mission Control, who then ordered absolute silence." - Maurice Chatelain - Former Chief of NASA Communications Systems
"For thirty years, I've held that image in my mind. What I saw was a circular object that looked like two pie plates put on top of each other with a golf ball on top. It was a classic flying saucer,and it shot a beam of something at our warhead" - U.S. Air Force Lieutenant Robert M. Jacobs
"How the CIA Views the UFO Phenomenon, Second Look, Vol. 1, No. 7, Washington, D.C. (5/1979) -- "We have, indeed, been contacted -- perhaps even visited -- by extraterrestrial beings, and the US government, in collusion with the other national powers of the Earth, is determined to keep this information from the general public." - Former Special assistant to the executive director os the CIA Victor Marchetti
"I believe that these extraterrestrial vehicles and their crews are visiting this planet from other planets which obviously are a little more technically advanced than we are here on Earth." - Colonel L. Gordon Cooper (Mercury 9,Gemini-5 Astronaut)
"I can assure you that, given they exist, these flying saucers are made by no power on this Earth." - President Harry S. Truman, 4 April 1950, at a press conference.
"I certainly believe in aliens in space, and that they are indeed visiting our planet. They may not look like us, but I have very strong feelings that they have advanced beyond our mental capabilities." - Senator Barry Goldwater (1965)
"I looked out the window and saw this white light.It was zigzagging around. I went up to the pilot and said,Have you ever seen anything like that? He was shocked and he said, "Nope." And I said to him: "Let's follow it!" We followed it for several minutes. It was a bright white light.We followed it to Bakersfield, and all of a sudden to our utter amazement it went straight up into the heavens. When I got off the plane I told Nancy all about it." - President Ronald Reagen (Describing his 1974 UFO encounter to veteran newsman Norman C. Miller, then Washington bureau chief for the Wall Street Journal.)
"I'm not at liberty to discuss the governments knowledge of extraterrestrial UFO's at this time. I am still personally being briefed on the subject!" - President Richard M. Nixon
"I've been asked about UFO's and I've said publicly I thought they were somebody else, some other civilization." - Commander Eugene Cernan, Commanded the Apollo 17 Mission. (LA TIMES, 1973)
"In my official status, I cannot comment on ET contact. However, personally, I can assure you, we are not alone!" - Charles J. Camarda(Ph.D.) NASA Astronaut
"It was the darndest thing I've ever seen. It was big, it was very bright, it changed colors and it was about the size of the Moon. We watched it for ten minutes, but none of us could figure out what it was. One thing's for sure, I'll never make fun of people who say they've seen unidentified objects in the sky." - President Jimmy Carter
"Let there be no doubt. Alien technology harvested from the infamous saucer crash in Roswell, New Mexico, on July 1947 led directly to the development of the integrated circuit chip, laser and fibre optic technologies, particle beams, electromagnetic propulsion systems, depleted uranium projectiles, stealth capabilities, and many others.

How do I know? I was in charge!

I think the kids on this planet are wise to the truth, and I think we ought to give it to them. I think they deserve it." - Colonel Philip Corso Army Intelligence officer, former Head of Foreign Technology at the U.S. Army's Research and Development Department at the Pentagon. Four years Director of Intelligence on President Eisenhower's White House National Security Staff.
"Mission control, we have a UFO pacing our position, request instructions." - Astronaut Cady Coleman - NASA Transmission - Shuttle Mission STS-73
"Of course UFOs are real, and they are interplanetary. The cumulative evidence for the existence of UFOs is quite overwhelming and I accept the fact of their existence." - Air Chief Marshall Lord Hugh Dowding Commanding Officer of the Royal Air Force during WWII.
"Of course it is possible that UFO's really do contain aliens as many people believe, and the Government is hushing it up." - Professor Stephen Hawking
"The UFO phenomenon being reported is something real and not visionary or fictitious" - General Nathan Twining Chairman, Joint chiefs of staff, 1955-1958
"The phenomenon of UFOs does exist, and it must be treated seriously." - Mikhail Gorbachev
"This was no ordinary UFO. Scores of people saw it. It was no illusion, no deception, no imagination." - Air Marshall Azim Daudpota Zimbabwe Air Force, commenting on a UFO witnessed in July of 1985 by many people and tracked on radar.
"UFO sightings are now so common, the military doesn't have time to worry about them - so they screen them out. The major defense systems have UFO filters built into them, and when a UFO appears, they simply ignore it." - Lee Katchen (former atmospheric physicist with NASA)
"We have contact with alien cultures." - Astronaut Dr. Brian O'leary
"We must insist upon full access to disks recovered. For instance, in the LA case the Army grabbed it and would not let us have it for cursory examination." - J. Edgar Hoover
"UFOs do exist and aliens have visited the Earth. Certain identified flying objects or UFOs from outer space have visited Earth. The Government position on this is that the Government has no strategy regarding UFO sightings. It is possible that the mysterious drawings and designs of Nazca, Peru have alien origins." - Nobutaka Machimura - Japanese Chief Cabinet Secretary