Dumbells is episode 10a of Season 4 of Rocko's Modern Life.
Rocko gets arrested after a game of Ding Dong Ditch gets out of hand.
Heffer and Filburt are playing a game of Ding Dong Ditch when they get caught by Rocko. In order to demonstrate the prank, they bring Rocko to the O-Town Deluxe Apartments building and have him do the prank himself. But Rocko is eventually caught and Heffer and Filburt run away. The person who answers the door is Gladys Hippo and Rocko explains to her the game he was playing with his friends. Gladys laughs at this and Rocko walks away.
As Rocko returns home, Gladys rings his doorbell and runs around the yard. Rocko reminds her that she has to hide discreetly to play the game. So he has Gladys inside the house as he rings the doorbell. Rocko hides inside his mailbox. But when Gladys doesn't answer the door, Rocko walks inside his house and finds Gladys hiding behind his chair. So Rocko decides to demonstrate the game by ringing the doorbell of the Bigheads' house and hiding in his bushes as Ed answers the door to find no one there.
Soon, he and Gladys play Ding Dong Ditch at every house of O-Town and the news of the prank is being reported. When Rocko returns home, he finds Heffer and Filburt, who tell him that they are hiding due to the prank going out of hand. They put on a disguise and go on the lam as they leave. Rocko feels tired and eventually falls asleep.
The next day, Rocko wakes up to listen to his doorbell ring. He finds that the S.W.A.T. team is outside and they arrest him, along with Gladys as they are taken to court via van. When Heffer and Filburt find that Rocko is taking the blame for their prank, they arrive at the court room and confess. So Rocko and Gladys are exonerated and Rocko returns home to hear his phone ringing. He answers it and little does he know, Heffer, Filburt, and the judge are crank calling him, only for the judge to get the crank call wrong. The episode ends with Rocko asking who is calling him.