LORELAI: Your pod Grandpa is still happy as a clam.
Pod Grandpa: A reference to the film Invasion of the Body Snatchers [pictured], previously discussed. Once again, Luke and Lorelai are shown using the same reference points.
Happy as a clam: American phrase meaning “happy and content”. It’s a shortened form of the 19th century simile, happy as a clam at high tide. It’s only at low tide that clams can be gathered for a meal, so at high tide they should be happy and safe.
The Annotated Gilmore Girls 