The Powerpuff Girls S01 E11 Telephonies

"Saving the world before bedtime."

The Ganggreen Gang gets hold of the Mayor's hotline to the Powerpuff Girls and makes prank calls, sending the Girls on a wild goose chase all over town. However, when it's the notorious villain's Mojo Jojo, Fuzzy, and Him that the gang disturbs, they learn the price of making prank calls.