S3, E17: The gang squabble over a ring which they believe was used in `The Lord of the Rings'. Leonard wants to give it back to its original owner, Koothrappali wants to sell it so that he can buy a jet ski but Sheldon becomes obsessed with the ring and starts to turn into Gollum from The Lord of the Rings. Can the guys reach an agreement and will Sheldon return to normal?