One day Harley had accidentally messed up one of Joker's plans. Joker:You idiotic brat you keep screwing up get out now!!The Joker grabbed Harley & threw her outside.
Harley:Hey is that Batman over there?
Harley looked up in the sky & saw the Joker pull out a rocket launcher.
Harley pushed Batman out of the way & got hit by a missile
Batman:Oh no!
Batman grabbed Harley & threw a batarang at the Joker & knocked Joker out then he took Harley to the bat cave