One of my villagers fell out of a coconut tree and hit his head. I had a choice box come up asking what I wanted to do about it. I made the wrong choice and he ended up with amnesia and is now called "?".

I felt very guilty about poor ? so I spent 5,000 of the tech points I was collecting for the next level in a skill on a new set of clothes for him instead and now he's very easy to pick out in his nice new outfit :).