A person whose words or actions provoke or are intended to provoke amusement or laughter
A hidden, unsuspected clause or difficulty
Bringing in the Joker to act as Batman's foe in the movie was a good move as he is probably the most infamous of the bat villains.
Having followed powerful villains like the Joker, Scarecrow and Two Face, many are looking to the past Batman productions and comics for a glimmer of the future.
Just as Superman had Lex Luthor and Batman had his Joker, Wonder Woman also faced peril against her own Rogues Gallery of villains.
Batman can't take out his foe with an arsenal of missiles and machine guns, but the Joker can whip out an extended pistol and bring down the Batwing?
The biggest joker in current deck is Al Qaeda.