Who Is The Impractical Joker With A Key To Crime? With A Maniacal Laugh, A Twisted Sense Of Humor, And Penchant For Setting Cunning Traps, The Joker Is One Of Batmans Most Notoriously Fiendish Foes. But When It Comes To Putting An End To The Jokers Crime Sprees, Batman Knows Firsthand That The Jokers Jokes Are Never Very Funny In The End. Dc Retro Batman 66 The Joker 6-In Action Figure.