Struggle between World of Imagination and World of Reason
Dangerous Knowledge
Fear of Machines
Madness - Your own or others
Supernatural
Rational vs Irrational
Sublime Nature
Power of Ancestral Sins
Danger of Science
Powerful Secrets
Fear of going insane or trouble distinguishing between fiction and nonfiction.
A character's madness may reveal a darker reality. Insane characters often speak truths that normal characters wish to deny.
Nature is awesome - an anti-depressant!
Otherworldly elements: ghosts, aliens, witches, etcetera
The fear that machines will overtake us.
Actions that cursed future generations or the fear that they will.
Keeping secrets involves lack of trust, lies of omission, and outright lies.
People playing God
Difference between what is real and what is not.
Knowing how to do something that maybe probably/shouldn't be done