Highlights from the Fourteenth Episode of Season 5 of The Big Bang Theory

Leonard (Johnny Galecki, right) and Penny (Kaley Cuoco, left) experiment with dating, while Raj develops a peculiar relationship with his phone's virtual assistant, on THE BIG BANG THEORY. Photo: Monty Brinton/ CBS ©2012 CBS Broadcasting, Inc. All Rights Reserved.

Leonard (Johnny Galecki, right) and Penny (Kaley Cuoco, left) experiment with dating, while Raj develops a peculiar relationship with his phone's virtual assistant, on THE BIG BANG THEORY. Photo: Monty Brinton/ CBS ©2012 CBS Broadcasting, Inc. All Rights Reserved.

Leonard (Johnny Galecki, right) and Penny (Kaley Cuoco, left) experiment with dating, while Raj develops a peculiar relationship with his phone's virtual assistant, on THE BIG BANG THEORY. Photo: Monty Brinton/ CBS ©2012 CBS Broadcasting, Inc. All Rights Reserved.

Leonard and Penny experiment with dating, while Howard (Simon Helberg, center) and Sheldon (Jim Parsons, right) grow concerned when Raj (Kunal Nayyar, left) develops a peculiar relationship with his phone's virtual assistant, on THE BIG BANG THEORY. Photo: Monty Brinton/ CBS ©2012 CBS Broadcasting, Inc. All Rights Reserved.

Leonard and Penny experiment with dating, while Howard (Simon Helberg, center) and Bernadette (Melissa Rauch, right) grow concerned when Raj (Kunal Nayyar, left) develops a peculiar relationship with his phone's virtual assistant, on THE BIG BANG THEORY. Photo: Monty Brinton/ CBS ©2012 CBS Broadcasting, Inc. All Rights Reserved.

Leonard (Johnny Galecki, left) and Penny experiment with dating, while Raj develops a peculiar relationship with his phone's virtual assistant, and Amy (Mayim Bialik, center/pretzel) helps Sheldon (Jim Parsons, right) with a new project, on THE BIG BANG THEORY. Photo: Monty Brinton/ CBS ©2012 CBS Broadcasting, Inc. All Rights Reserved.

Leonard and Penny experiment with dating, while Raj develops a peculiar relationship with his phone's virtual assistant, and Amy (Mayim Bialik, left) helps Sheldon (Jim Parsons, right) with a new project, on THE BIG BANG THEORY. Photo: Monty Brinton/ CBS ©2012 CBS Broadcasting, Inc. All Rights Reserved.

Leonard and Penny experiment with dating, while Raj (Kunal Nayyar) develops a peculiar relationship with his phone's virtual assistant, on THE BIG BANG THEORY. Photo: Monty Brinton/ CBS ©2012 CBS Broadcasting, Inc. All Rights Reserved.

Leonard and Penny experiment with dating, while Howard (Simon Helberg, left) and Bernadette (Melissa Rauch, center) grow concerned when Raj (Kunal Nayyar, right/foreground) develops a peculiar relationship with his phone's virtual assistant, on THE BIG BANG THEORY. Photo: Monty Brinton/ CBS ©2012 CBS Broadcasting, Inc. All Rights Reserved.

Leonard (Johnny Galecki, right) and Penny (Kaley Cuoco, left) experiment with dating, while Raj develops a peculiar relationship with his phone's virtual assistant, on THE BIG BANG THEORY. Photo: Monty Brinton/ CBS ©2012 CBS Broadcasting, Inc. All Rights Reserved.