hmmm... Joker driving a car made from his hair. Although, if Batman's cape were to come alive, it would probably have a goofy, sassy, spunky personality and Batman would have an "Odd Couple" relationship with it until it's burned to death by Joker.
Possible compelling storylines:
Poison Ivy makes love to a Smurf
or
Joker makes love to a mermaid
In my dream, the world had suffered a terrible disaster. A black haze shut out the sun, and the darkness was alive with the moans and screams of wounded people. Suddenly, a small light glowed. A candle flickered into life, symbol of hope for millions. A single tiny candle, shining in the ugly dark. I laughed, and blew it out. - Joker