Warning: Predestination Pitfalls ahead! Do not attempt to navigate these treacherous waters unless you're prepared to lose your mind.
The Novikov Self-Consistency Principle is a myth. A cruel joke played by the universe. Every decision, every action, every burp, is a fork in the timeline, a branching path that leads to a reality where you're stuck in an infinite loop of reruns.
Example:
Grandfathered In for more information.
Or, if you're feeling brave, try Predestination Pitfalls Pitfalls.