I know the YouTube video Brain-Dead Teen, Only Capable Of Rolling Eyes And Texting, To Be Euthanized was just a hoax. However, since they did a really good job of making so many people believe the story, they must have done the hard work of researching how to make it very difficult for people to derive a contradiction from the information in the story and the information they learned before. For example, the doctor in the video said she might say "Are you for real killing me right now," and showed a fake scan of her brain showing that only a tiny bit of her brain is still functioning. For those who didn't realize it was a hoax, a logical explanation might be that not only was so little of her brain still functioning but also her remaining functioning neuron cells started synchronizing in very large numbers so what was left of her brain was actually working in a very simple way so she could say something while she was really like a robot with no complex brain actions leading her to say that or any conscious awareness of any sort while she's saying that. I believe that can't actually happen because I think everybody's brain is destined to undergo sudden savant syndrome after enough time as described in this question.