I had a rough childhood. I watched my parents murdered right before my eyes. Shot point-blank by some two-bit thug.
So I ran away from Gotham and wandered the earth, until eventually Liam Neeson found me in an obscure Asian jail. He gave me a home, taught me to fight, and showed me the true meaning of justice meant wearing black rubber latex and speaking really deeply.
Then I killed him with a flying commuter train.