The guys and the girls are having their own individual gatherings this weekend. Penny is organizing Amy's bachelorette party. Amy is expecting it to be a wild and crazy t ...

Sheldon is having a mental block about his research into dark matter, and is wondering if he made a mistake changing his area of research. Based on a comment by Penny abo ...

Penny initially declines an invitation from Amy Farrah Fowler, who considers Penny her best friend, to accompany her, Sheldon, Leonard, Howard, Raj and Bernadette to a we ...

After Leonard and Sheldon have a heated argument about what Sheldon sees as Leonard making a major breach in the roommate agreement, Leonard takes refuge at Penny's apart ...