7 things that really probably do not exist

The Mongolian Death Worm
The Golden Plates that Joseph Smith translated the Book of Mormon from (sorry, Mormons, I like you, but you have to admit, the provenance is ropey and the claim that the plates had to be returned to a celestial librarian seems a little "convenient")
Thetans
Glittery vampires
The Force (ooh, controversial)
Altruistic cats
Aliens in flying saucers probing people

What would you add? (Or what of these does exist?)