The New Scientist's Mindscapes column profiles Graham, who has the condition known as Cotard's Syndrome, in which a sufferer believes that he is dead or no longer exists.
"When I was in hospital I kept on telling them that the tablets weren't going to do me any good 'cause my brain was dead. I lost my sense of smell and taste. I didn't need to eat, or speak, or do anything. I ended up spending time in the graveyard because that was the closest I could get to death." (Source)
Stuff like this freaks me out a little bit. Also those reality medical shows. One day you're perfectly fine; next thing you know, you're foaming at the mouth and paralysed from the eyebrows down because you picked up a pen with a germ on it. Those make me want to sit still in an empty room and stay quiet for a very long time. But even that could cause medical problems. YOU JUST CAN'T WIN, MAN.