Also known as "I told you so" theory, where every decision is a butterfly that can either kill or spare humanity.
Subpages: Quantum Uncertainty Principle Butterfly Effect Paradox
A classic, yet totally unscientific, approach to solving predestination. Just blame your grandparent.
Subpages: Grandfather Time Travelers Grandfather Paradox Solved
Where every decision is made by a person with a questionable haircut.
Subpages: It's Me Paradox Me and My Hairdresser