Tonton Streaming The Amazing World of Gumball (2011) S1E25 - The Poltergeist

Richard believes there's a ghost in the attic but is actually Mr. Robinson who Gumball moved up there after entering a catatonic state due to being kicked out by his wife. Gumball and Darwin work on trying to restore Mr. Robinson whilst Richard, unaware of this, sets traps for the ghost.