UFOs & "Ghosts" for me. Not so much ghost but spirits that may be stuck "in between".
UFOs because, IMO, you'd have to be pretty naive to believe that we're the only ones in the entire universe, In a basketball court our solar system is but a spec of dust. Even if there is no proof or if no Alien has ever been to earth it could still be very true. Maybe they haven't found our back water planet or maybe they just don't care.
Nice thread by the way Keith.
But, I can see this one turning south.
Hope not.