For some reason today I was thinking about a book I read about fifteen years ago. I couldn't remember the title or the author or the plot. The only things I could remember were that it was about a strange boy and I loved it. It was driving me up the wall though and so I tried googling "young adult book strange boy" and didn't see anything familiar. But then I remembered that the word "alien" came into it somehow, added that to the google search and voila: The Only Alien on the Planet.
Somehow I suspect that this is one of those books that doesn't hold up so well once you're past childhood though.