Rare brain disorders that make people think they're dead and bring other bizarre delusions

Imagine being able to feel everything another person is feeling - their pleasure and their pain? Or being convinced, despite all evidence to the contrary, that you're dead?

These are just a few of the strange brain disorders that have plagued a rare set of people over the years. Oliver Sacks' classic book "The Man Who Mistook His Wife for a Hat" introduced us to some of the strangest brain disorders people suffer from, but that's only the tip of the iceberg.

Here are a few of the most bizarre mental conditions out there.