Big Bang Theory

The Valentino Submergence: Sheldon and Amy host a Valentine's Day episode of Fun with Flags, while Leonard and Penny grapple with getting older. (HD)

The Positive Negative Reaction: Bernadette has some news to share, but the reactions are not quite what she expected. (HD)

The Positive Negative Reaction: Bernadette has some news to share, but the reactions are not quite what she expected.

The Celebration Experimentation: Amy convinces Sheldon to celebrate his birthday for the first time since childhood. The groups invites actor Adam West to attend the party. (HD)

The Application Deterioration: Leonard, Sheldon and Howard face problems when they file for a patent for their infinite persistence gyroscope. (HD)

The Application Deterioration: Leonard, Sheldon and Howard face problems when they file for a patent for their infinite persistence gyroscope.