As Batman and Robin have to deal with the menace of the Joker, their problems...
The New Adventures of Batman
Season 1 Episode 4: A Sweet Joke On Gotham City
Sweetooth, a sugar-obsessed villain, breaks into Gotham City's water supply and replaces all the water there with chocolate syrup. Batman attempts to deal with the criminal, but is pressurised by his ever-increasing insane demands. Batman has to restore the water supply to the city before it's time runs out.