Fan Casting Martha Wayne in Batman: Family of Steel

At another point during the battle, Bruce is firing Kryptonite bullets at Superman, while also dodging laser beams from other members of the Superfamily. And as soon as he fires another bullet, a lightning bolt flashes before his eyes in the thunderstorm, and for a brief moment, he sees his mother, Martha Wayne, as the Flashpoint Joker laughing hysterically. The same way previous Jokers like Arthur Fleck, Jack Napier, Dexter Dent, and a few others laughed during their tenure as The Clown Prince of Crime.