1.72. She grabbed his ring, pulled on it, and dropped it. (JM, from Math for Girls)
1.72 answer: They were skydiving. He broke his arm as he jumped from the plane by hitting it on the plane door; he couldn't reach his ripcord with his other arm. She pulled the ripcord for him.
1.72 variant answer: (sketch) The ring was attached to the pin of a grenade that he was holding. Develop a situation from there.
1.72 variant answer: The ring is the engagement ring that he gave her. She's calling off the engagement. (JD)