I have and probably always will believe in UFOs, and I hope I see one someday. The problem with that mentality is that when someone believes in something, they can sometimes misconstrue what they see (or what happened). Totally off topic, but people that go to see "Crossing Over with Jon Edwards" (where he talks to dead relatives) mostly believe in him, and will walk out of there believing that what happened was real. Nevermind the fact that he uses both hot and cold reading techniques, but that's a whole different story. Anyhow, point of the whole rant there is to say that if we WANT to see something we are more likely to believe that something we saw is a UFO or ghost or whatever the case.
This whole topic reminded me of Mars, 1976. When they took pictures of the Cydonia region they found a face and pyramids. Here's the face (you can google mars pyramids, they are right next to the face in the same region...I couldn't find the picture I was looking for though).
Granted, recently when they went over the same region in Mars the results were less than impressive, but it's still something to think about. Nobody else has mentioned either: Area 51.
I'm not sure how many people from other countries know about this, but in the US in Nevada there's a "top secret" military base. Many people say that they have seen (and many have filmed) strange objects flying above the base at night. There's something else for you to google...
Anyhow, I believe in UFOs and some form of extraterrestrial life, but I don't really believe in abductions. Speaking of abductions, if you want to hear about a relatively convincing one at least, you can look up the name Travis Walton...who was supposedly abducted back in 1979 I think.