“The Fisher King” is a disorganized, rambling and eccentric movie that contains some moments of truth, some moments of humor, and many moments of digression. The filmmakers are nothing if not generous; we get urban grit, show-biz angst, two love affairs, the holy grail, the homeless, an action sequence, a dance sequence, and an apocalyptic figure on a horse who rides through Central Park with flames shooting from his head. Even with such excess, at 137 minutes the movie shows signs of having been pruned of some of its quiet spots - or did they intend to have all those scenes, back to back, in which people shout at each other? The film stars Jeff Bridges as Jack, a radio talk show host whose unbalanced listener goes on a shooting spree, apparently following Jack's advice. Jack is devastated and quits his job and drops out into a long, alcoholic reverie, only to be redeemed by Parry (Robin Williams), a homeless man who is convinced the holy grail is in the possession of a Manhatt