The Grandfather Paradox
So, you've heard of the Grandfather Paradox, right? It's like, if you went back in time and killed your own grandfather before he had kids, then he never had kids, so you were never born, so you went back in time and killed your own grandfather... but what if you went back in time and killed a younger, less annoying grandparent?
This paradox is a classic, but let's be real, it's not like you'd be able to go back in time and pull it off, even if you wanted to. Unless... unless you're a time-traveling, assassin-in-training. In that case, go to our Grandfather Time-Traveling Super Spy guide for more information.