You named your dog after your favorite player: acceptable show of loyalty. You wore the same boxers every game for an entire season: mildly obsessed. (It was a winning season, after all.) You erected a seven-foot shrine to the star quarterback in your back yard: you qualify as a psycho fan. If that's the case, the ESPN Guide to Psycho Fan Behavior (ESPN Books, 2007; $14.95) is for you. Edited by Warren St. John and written by "researchers from the Institute for the Advancement of Psycho Fan Studies," the book covers essential topics such as "A User's Guide to Body Paint," "Strategies for Effective Heckling," and the ins and outs of sports tattoos. You'll also find a countdown of 10 Psycho Fan Hall of Fame inductees - and these nut jobs will make your halftime-streaking best friend seem like your average sports buff. Peel yourself away from the game long enough to pick up your copy at Borders (511 Boylston Street, Boston, 617.236.1444).