After reading about the tragic suicide of actor Andrew Koenig, best known for his portrayal of “Boner” during the 1980s on television’s Growing Pains, I was surprised to learn he played the Joker in one of the best fan films I’ve ever seen, Batman: Dead End. Apparently this short movie premiered during the summer of 2003 at the San Diego Comic Con, but I wasn’t aware of it until Dan showed it to me last year. I’ve posted the movie …