Amnesiac Batman

Batman uses his trusty grappling hook to scale the side of a building while in pursuit of the villainous Joker and his henchman. Suddenly, the chase comes to an abrupt halt when the hook slips and the dark knight plummets several stories, clipping various obstacles on his way down before he hits the cold concrete of the alley below with a hard thud. After a brief period of unconsciousness he awakens and sits up, disoriented and confused. He has no memory of where he is or how he got there. In fact, he has no memory at all of who he is. All he knows is that he has no idea what's happening and he feels like he was just hit by a bus.