Futurama
S4E1: Roswell That Ends Well
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Stay away from him, you dimwitted monkey!
You mustn't interfere with the past.
Don't do anything that affects anything...
unless it turns out you were supposed to do it,
in which case, for the love of God, don't not do it!
Got it.
If, for example, you were to kill your grandfather,
you'd cease to exist.