The cast of "The Big Bang Theory."Warner Bros. Television - Monday, September, 12, 2011, 11:12 PM

Kunal Nayyar as Koothrappali and Simon Helberg as Wolowitz in "The Big Bang Theory."Warner Bros. Television - Monday, September, 12, 2011, 11:12 PM

Johnny Galecki as Leonard and Kaley Cuoco as Penny in "The Big Bang Theory."Warner Bros. Television - Monday, September, 12, 2011, 11:12 PM

Johnny Galecki stars as Leonard in "The Big Bang Theory."Warner Bros. Television - Monday, September, 12, 2011, 11:12 PM

Jim Parsons stars as Sheldon in "The Big Bang Theory."Warner Bros. Television - Monday, September, 12, 2011, 11:12 PM

Kaley Cuoco stars as Penny in "The Big Bang Theory."Warner Bros. Television - Monday, September, 12, 2011, 11:12 PM

Simon Helberg stars as Wolowitz in "The Big Bang Theory."Warner Bros. Television - Monday, September, 12, 2011, 11:12 PM

"The Skank Reflex Analysis" -- The gang deals with the aftermath of Penny and Raj's night together, while Sheldon takes command of the paintball team, on the fifth season premiere of THE BIG BANG THEORY, Thursday, Sept. 22 (8:00-8:31 PM, ET/PT) on the CBS Television Network. Pictured (left to right): Kunal Nayyar, Melissa Rauch, Simon Helberg, Jim Parsons, Mayim Bialik, Johnny Galecki, Kaley Cuoco. Photo: Cliff Lipson/CBS ©2011 CBS Broadcasting Inc. All Rights Reserved.CBS/Cliff Lipson - Tuesday, September, 13, 2011, 2:13 AM

"The Skank Reflex Analysis" -- The gang deals with the aftermath of Penny and Raj's night together, while Sheldon (Jim Parsons, far left) takes command of the paintball team (left to right: Kunal Nayyar, Johnny Galecki, Simon Helberg), on the fifth season premiere of THE BIG BANG THEORY, Thursday, Sept. 22 (8:00-8:31 PM, ET/PT) on the CBS Television Network. Photo: Cliff Lipson/CBS ©2011 CBS Broadcasting Inc. All Rights Reserved.CBS/Cliff Lipson - Tuesday, September, 13, 2011, 2:13 AM

"The Skank Reflex Analysis" -- The gang (Simon Helberg, center; Jim Parsons, second from right; Johnny Galecki, far right) deals with the aftermath of Penny (Kaley Cuoco, far left) and Raj's (Kunal Nayyar, second from left) night together, while Sheldon takes command of the paintball team, on the fifth season premiere of THE BIG BANG THEORY, Thursday, Sept. 22 (8:00-8:31 PM, ET/PT) on the CBS Television Network. Photo: Cliff Lipson/CBS ©2011 CBS Broadcasting Inc. All Rights Reserved.CBS/Cliff Lipson - Tuesday, September, 13, 2011, 2:13 AM

"The Skank Reflex Analysis" -- The gang deals with the aftermath of Penny (Kaley Cuoco, left) and Raj's (Kunal Nayyar, right) night together, while Sheldon takes command of the paintball team, on the fifth season premiere of THE BIG BANG THEORY, Thursday, Sept. 22 (8:00-8:31 PM, ET/PT) on the CBS Television Network. Photo: Cliff Lipson/CBS ©2011 CBS Broadcasting Inc. All Rights Reserved.CBS/Cliff Lipson - Tuesday, September, 13, 2011, 2:13 AM

"The Skank Reflex Analysis" -- Bernadette (Melissa Rauch, left) and the gang deal with the aftermath of Penny and Raj's (Kunal Nayyar, right) night together, while Sheldon takes command of the paintball team, on the fifth season premiere of THE BIG BANG THEORY, Thursday, Sept. 22 (8:00-8:31 PM, ET/PT) on the CBS Television Network. Photo: Cliff Lipson/CBS ©2011 CBS Broadcasting Inc. All Rights Reserved.CBS/Cliff Lipson - Tuesday, September, 13, 2011, 2:13 AM

"The Skank Reflex Analysis" -- Amy (Mayim Bialik, left) and the gang deal with the aftermath of Penny (Kaley Cuoco, right) and Raj's night together, while Sheldon takes command of the paintball team, on the fifth season premiere of THE BIG BANG THEORY, Thursday, Sept. 22 (8:00-8:31 PM, ET/PT) on the CBS Television Network. Photo: Cliff Lipson/CBS ©2011 CBS Broadcasting Inc. All Rights Reserved.CBS/Cliff Lipson - Tuesday, September, 13, 2011, 2:13 AM

The cast of "The Big Bang Theory ."CBS/Warner Bros. Entertainment - Friday, September, 24, 2010, 12:24 AM

Johnny Galecki stars in "The Big Bang Theory." CBS/Monty Brinton - Monday, July, 26, 2010, 11:26 PM

Kaley Cuoco stars in "The Big Bang Theory." CBS/Monty Brinton - Monday, July, 26, 2010, 11:26 PM

Simon Helberg stars in "The Big Bang Theory." CBS/Monty Brinton - Monday, July, 26, 2010, 11:26 PM

Kunal Nayyar stars in "The Big Bang Theory." CBS/Monty Brinton - Monday, July, 26, 2010, 11:26 PM

Jim Parsons stars in "The Big Bang Theory." CBS/Monty Brinton - Monday, July, 26, 2010, 11:26 PM

The cast of "The Big Bang Theory."The CW/Warner Bros. International Television - Tuesday, August, 25, 2009, 6:25 PM

Johnny Galecki stars as Leonard on "The Big Bang Theory."CBS/Warner Bros. International Television - Tuesday, August, 25, 2009, 6:25 PM

Jim Parsons stars as Sheldon on "The Big Bang Theory."CBS/Warner Bros. International Television - Tuesday, August, 25, 2009, 6:25 PM

Kaley Cuoco stars as Penny on "The Big Bang Theory."CBS/Warner Bros. International Television - Tuesday, August, 25, 2009, 6:25 PM

Kaley Cuoco stars as Penny and Jim Parsons stars as Sheldon on "The Big Bang Theory."CBS/Warner Bros. International Television - Tuesday, August, 25, 2009, 6:25 PM