Lucy complains when Mr. Mooney's barking sheepdog Nelson keeps her and Viv up all night. When she mentions this to him, sarcastic Mooney tells her to sue him. So she takes him to court and acts as her own lawyer.
Lucy's melodramatic courtroom skills were all learned from watching Perry Mason on TV. After making a shambles of the court proceedings, she finally makes her point by cross-examining Nelson, the dog.