I'm wondering to myself how many people out there believe UFOs exist and I guess the number has to be pretty high. For those people that don't think UFOs exist I highly recommened reading the links supplied below pertaining to Project Blue Book and The Portage County UFO chase. I also recommend you do some searching online, but not stay away from the sites that are too "off the wall" with there theories. Some people just want attention and seem to take away from the people that are really telling the truth. Anyway the Portage County UFO chase is of particular note because four, count 'em, FOUR police officers chased a UFO for thirty minutes. The government tried to cover it up and say it was a weather balloon, there were also countless other witnesses. At any rate, if you don't believe in UFOs or extraterrestial life I highly suggest reading the two links below, perhaps that will change your mind a bit.
http://www.ufocasebook.com/portage.html
http://www.ufoevidence.org/topics/ProjectBlueBook.html