Imagine somebody going back in time, and killing their grandmother before she had children,
If their grandmother died, the person who killed her wouldnt be born.
However, if that person wasnt born, he/she couldnt have killed their grandmother.
DUN DUN DUUUUUUUN
Technically the Grandfather Paradox. You go back in time to meet your grandfather who tells his grandson about a guy who looked like him who he met long ago, sometimes you can meet the baby version of you and tell tips on how to survive in the future. But then when he gets the tips, he got it himself in the past and back in present day. FUCK IT. Paradox confuse me