"Lamb to the Slaughter" Giggling Paragraph

One of the reasons why Mary Maloney from the book "Lamb to the Slaughter" giggled was because she thought it was funny. She giggled at the four police men when they said "I think the weapon is right under our nose" because it was. Mary Maloney murdered her husband with a frozen lamb leg and asked the police men to eat, so there wasn't evidence that she killed him.