Granting it the same distinction as the playground where a third-grader stepped on a huge needle and the community swimming pool where someone dove in and broke his neck, neighborhood sources confirmed Wednesday that the grade-schoolers residing in the Acorn Hills subdivision had awarded landmark status to the house on Birch Street where a guy killed himself. He blew his head off right there on the second floor, said 11-year-old Alex Novak, pointing toward a window of the newly designated civic monument before a crowd of peers, who had gathered outside the residence to listen to knowledgeable sources offer prepared remarks about the site and its local significance. I heard that they couldnt get all the brains off the walls, so they had to repaint the whole thing. The guy owed a lot of money to the mob or something. At press time, several members of the afternoon visitor group had rung the doorbell of the newly christened landmark and torn off. 