Jamal Khashoggi was on the cusp of starting a democracy group to provide "a counter narrative in the Arab world and the West to Arab Spring skeptics" when the Saudis disappeared him.
The idea that if you supposedly went back in time to pick yourself up, and went back with yourself in the future, and something prevented you from going to the past (death, coma, etc), you would disappear from the time frame entirely, due to the fact that if you dissapeared in the past, you would dissapear in the future.
However, if you dissapeared in the future, you never would have been in the past to pick yourself up.
Disappear Paradox:
1. You're in the present.
2. You see yourself, and then you kidnap you.
3. you will dissapear from the time frame forever, probably because it's impossible to go back in time, or you are trapped in the future by death, coma, etc.
4. If you dissapear, then you're future self disappears, because you dissapear. However, you would never kidnap yourself if you dissapeared, and you would be back in the present, and you would kidnap yourself again. And again, and again...
A person pretending to be something they aren't, or an impostor. This is inferred because of the old alien movies where alien pods appear on earth and the "pod people" dispose of the humans and slowly reproduce the bodies, pretending to be humans.
The pod person was pretending to be my father, but I knew that he was an alien when he acted differently than my father ever would have.