Assuming the clowns aren't allowed to kill/interfere with each other?
Joker makes a bomb out of pesticides and aerosol cans or something crazy like that and does in the whole city. Its possible. comic book characters are funny for stuff like that. Jokers would be like a bell curve..
Ie. would you rather have (violator) me give you 1 million dollars divided equally between the 31 days of the month.
Or (joker) a penny on the first day, but you double the amount each day from the first over and over,... and you get to keep each amount. so that day 1 you have 1 penny. day two you have 3 pennies (cause 1 penny plus day twos, two pennies... etc etc... you'd end up with like 5 million or so... i forget the math calculation)