do UFOs exist?

I'm watching UFO Hunters on the History channel, and I have to admit, the stories they present are pretty believable. Eyewitness testimony from seemingly reliable people, radar trackings, sightings by pilots trained to identify and challenge enemy aircraft...they even had a former UK Ministry of Defense officer whose job entailed investigating UFO sightings. You can check out the UFO Hunters' magazine here.

I've never seen anything resembling a UFO, although there were lots of nights spent searching the skies with hopes high when I was a young teen.

I asked my brother-in-law, the USAF pilot if he's ever seen anything. Nada.

How about you? Ever seen a UFO?