The Big Bang Theory Season 7 Episode 16
The Table Polarization
Leonard decides to buy a dining room table so the group dinners are more comfortable. Sheldon freaks out because he doesn't like change. He accuses Penny of changing Leonard since they started dating. They explain that Amy's changed him too. So, he decides that he has to break up with her.
Penny warns Amy about Sheldon. Amy manipulates Sheldon into not breaking up with her. She tries to get him to agree to move in with her, but he gives into the new table instead.
When they have dinner, Sheldon and Amy sit on the couch. Bernadette feels bad and they all end up eating in the living room.
Howard is offered the opportunity to go back to space. He's excited about the opportunity until Bernadette and an astronaut remind him of how much he hated being in space. Howard manipulates his health test to show high blood pressure so he can't go.