Title: Fooly Cooly
Original air date: August 5, 2003

Summary:
Naota Nandaba, while walking with his older brother's delusional "girlfriend", seventeen year old Mamimi Samejima, is struck by a Vespa driver, who revives Naota and hits him in the head with her bass guitar before driving off. This turns it into an N.O. channel, from which objects and other beings can be pulled. Naota discovers a horn protruding from his head where he was hit, concealing it with a bandage. He keeps the horn secret from his classmates the next day and he goes to the hospital, where he again encounters the mysterious woman disguised as a nurse. He flees before she can strike him again with her guitar. At dinner, Naota discovers that his father Kamon has hired his mysterious assailant, Haruko Haruhara, to be their housekeeper and moreover, that they will be roommates. After learning from Haruko that she is "an alien" and frustrated with her, he goes downstairs and discovers that Mamimi had stopped by. Naota runs off and meets her at a bridge, where suddenly a robot, followed by a detached robot hand, emerges from the horn on his head, and begin to fight. After the robot triumphs, it is struck by Haruko with her guitar.
http://en.wikipedia.org/wiki/List_of_FLCL_episodes