The Big Bang Theory Season 8 Episode 11
The Clean Room Infiltration
Leonard and Howard are working in a clean room when a pigeon flies into the room contaminating the work space. They decide to keep it secret and try to get the bird out of the room. Their attempts to remove the pigeon are unsuccessful, so they call Raj to come help them. It's suggested to put a Slim Jim in a garbage bag. Leonard discounts the idea and then the pigeon takes the Slim Jim from his hand.
They use a fire extinguisher to hit the bird and it falls to the ground and appears to be dead. Howard performs mouth-to-beak to the bird and it comes to life and flies to the top of the room. Leonard calls Penny to explain why they are late to Christmas at Amy's place. She suggests they remove their name from the sign in sheet. Leonard says they can't do that and then that's exactly what they do.
Amy's hosting a Victorian Christmas at her place despite Raj's reminders the friends don't appreciate themed parties. Everyone seems excited about it. Bernadette drives Sheldon to the Amy's house. On the way there Sheldon decides he needs to stick it to Amy by buying her a gift after they agreed not to get each other something.
He gets his picture taken with Santa and has it framed. Despite Sheldon's plan, Amy loves the gift, especially the message Sheldon recorded. His plan backfires when she presents him with a gift too. She made him his Mee-maw's cookies. They really do love each other.