There's this one person I read about who literally remembers everything that's ever happened to her. Her memory is like a movie theater. She can recall any thought she ever had with crystal clarity.
There's also this one guy who doesn't remember anything since 1962. In that year, the herpes virus chewed through his brain like an apple. He'll act perfectly normal while your talking to him, but he literally can't recall anything for more than several seconds unless it happened before 1962.
Memory is a depressing thing.
Herpes? In the brain? How does that happen?