Of course!

The grandfather paradox is a philosophical thought experiment where someone goes back in time and kills their own grandfather. According to our understanding of causality and time, this would prevent the person who traveled back in time from ever being boring, so they would not be able to take this action.

There are other causality paradox thought experiments as well. For example the bootstrap paradox in which a person goes back in time to give a younger version of themself an object and carry it through time, making it seems as the object came out of nowhere.
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