Man Without a Memory

This clip, from a BBC documentary on time relativity, is about a man named Clive Wearing. He has the worst recorded case of amnesia in history.

After contracting viral encephalitis, Clive developed anterograde amnesia, a condition which does not allow new memories to become long-term memories. Repeatedly, throughout every day, Clive has the experience of waking up for the very first time in his life, as if he is just coming into consciousness that very instant. The only person he remembers is his wife, and every time he sees her, it is as if he hasn't seen her in years.

This is an extraordinary story, and if you're as fascinated as I am, check out some deeper studies of Clive's case. There are two BBC documentaries available here.