Some people believe in ghosts.
Other people believe in UFOs.
I believe in ghosts in UFOs.
Think of it... ghosts are the spirits of the dead who still have something left to accomplish in life that keeps them around, right?
So, there's bound to be some ghosts who are obsessed with exploring the universe in search of life on other planets.
That means - ghosts in UFOs.
Of course, they could be the ghosts of ghost hunters, people who look for ghosts as proof of life after death.
That means they're searching for signs of death on other planets, I guess.
