"The Decoupling Fluctuation" -- When Sheldon learns that Penny is thinking about breaking up with Leonard, he tries to intervene. Meanwhile, in space, the other astronauts pick on Howard, on THE BIG BANG THEORY, Thursday, Oct. 4 (8:00-8:31 PM, ET/PT) on the CBS Television Network. Pictured left to right: Melissa Rauch, Kaley Cuoco and Mayim Bialik Photo: Michael Yarish/Warner Bros. ©2012 Warner Bros. Television. All Rights Reserved.

"The Decoupling Fluctuation" -- When Sheldon (Jim Parsons, left) learns that Penny is thinking about breaking up with Leonard (Johnny Galecki, center), he tries to intervene, on THE BIG BANG THEORY, Thursday, Oct. 4 (8:00-8:31 PM, ET/PT) on the CBS Television Network. Also pictured: Kunal Nayyar (right) Photo: Michael Yarish/Warner Bros. ©2012 Warner Bros. Television. All Rights Reserved.

"The Decoupling Fluctuation" -- When Sheldon learns that Penny is thinking about breaking up with Leonard, he tries to intervene. Meanwhile, in space, the other astronauts pick on Howard, on THE BIG BANG THEORY, Thursday, Oct. 4 (8:00-8:31 PM, ET/PT) on the CBS Television Network. Pictured left to right: Mayim Bialik, Jim Parsons, Kevin Sussman, Kunal Nayyar, Johnny Galecki and Kaley Cuoco Photo: Michael Yarish/Warner Bros. ©2012 Warner Bros. Television. All Rights Reserved.

"The Decoupling Fluctuation" -- When Sheldon learns that Penny is thinking about breaking up with Leonard, he tries to intervene. Meanwhile, in space, the other astronauts pick on Howard, on THE BIG BANG THEORY, Thursday, Oct. 4 (8:00-8:31 PM, ET/PT) on the CBS Television Network. Pictured left to right: Mayim Bialik, Jim Parsons and Kevin Sussman Photo: Michael Yarish/Warner Bros. ©2012 Warner Bros. Television. All Rights Reserved.

"The Decoupling Fluctuation" -- When Sheldon (Jim Parsons, right) learns that Penny is thinking about breaking up with Leonard, he tries to intervene, on THE BIG BANG THEORY, Thursday, Oct. 4 (8:00-8:31 PM, ET/PT) on the CBS Television Network. Also pictured: Kevin Sussman (left) Photo: Michael Yarish/Warner Bros. ©2012 Warner Bros. Television. All Rights Reserved.

"The Decoupling Fluctuation" -- When Sheldon learns that Penny (Kaley Cuoco, left) is thinking about breaking up with Leonard (Johnny Galecki, right), he tries to intervene on THE BIG BANG THEORY, Thursday, Oct. 4 (8:00-8:31 PM, ET/PT) on the CBS Television Network. Photo: Michael Yarish/Warner Bros. ©2012 Warner Bros. Television. All Rights Reserved.