Joe Mazzulla revealed the story behind getting a "Why so serious" tattoo: "The Joker had no rules but he really wanted honesty" originally appeared on Basketball Network.

The Joker: Year One fills in some of the big gaps in Joker's origin story. Here are three big ways this story changes the Clown Prince of Crime forever.

Batman’s nemesis Joker returns to theaters — this time he’s got a song in his heart The origin story of the "Joker" continues, as the sequel "Joker: Folie à Deux" hits theaters on Friday.