Manny people don't know what's happening here on earth, or even next door in many instances.
While not convinced of UFO's and life on other planets, I surely can't unequivocally deny their existence either.
UFO stories are kind of like ghost stories.
Have I ever seen or felt that could have been ghost or the supernatural?
Yes, almost everyone has.
However, I think that perception is more about how the human brain works rather than the reality you see around you.