9 Moments from The Big Bang Theory's "The Intimacy Acceleration"

1. "The Intimacy Acceleration"

Leonard, Amy, Raj and Emily spend the evening trying to escape a room with a "zombie," on THE BIG BANG THEORY, Thursday, Feb. 26 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Pictured left to right: Johnny Galecki, Mayim Bialik, Kunal Nayyar and Laura Spencer Photo: Monty Brinton/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved
Sheldon and Penny get to know each other better

2. Sheldon and Penny get to know each other better

As a joke, Sheldon (Jim Parsons, right) and Penny (Kaley Cuoco-Sweeting, left) try an experiment designed to make participants fall in love, on THE BIG BANG THEORY, Thursday, Feb. 26 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Photo: Monty Brinton/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved
Staring into each other eyes

3. Staring into each other eyes

As a joke, Sheldon (Jim Parsons, right) and Penny (Kaley Cuoco-Sweeting, left) try an experiment designed to make participants fall in love, on THE BIG BANG THEORY, Thursday, Feb. 26 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Photo: Monty Brinton/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved
The group talks about performing an experiment

4. The group talks about performing an experiment

As a joke, Sheldon and Penny try an experiment designed to make participants fall in love. Also, Leonard, Amy, Raj and Emily spend the evening trying to escape a room with a "zombie," on THE BIG BANG THEORY, Thursday, Feb. 26 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Pictured left to right: Kunal Nayyar, Mayim Bialik, Jim Parsons, Johnny Galecki and Kaley Cuoco-Sweeting Photo: Monty Brinton/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved
Going into a room with a zombie

5. Going into a room with a zombie

Leonard, Amy, Raj and Emily spend the evening trying to escape a room with a "zombie," on THE BIG BANG THEORY, Thursday, Feb. 26 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Pictured left to right: Molly Morgan, Johnny Galecki, Mayim Bialik, Laura Spencer and Kunal Nayyar Photo: Monty Brinton/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved
Getting scared

6. Getting scared

Leonard, Amy, Raj and Emily spend the evening trying to escape a room with a "zombie," on THE BIG BANG THEORY, Thursday, Feb. 26 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Pictured left to right: Max Alder, Mayim Bialik, Kunal Nayyar and Laura Spencer Photo: Monty Brinton/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved
A cute couple

7. A cute couple

As a joke, Sheldon and Penny try an experiment designed to make participants fall in love. Also, Leonard, Amy, Raj and Emily spend the evening trying to escape a room with a "zombie," on THE BIG BANG THEORY, Thursday, Feb. 26 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Pictured left to right: Johnny Galecki and Kaley Cuoco-Sweeting Photo: Monty Brinton/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved
Speaking to baggage services

8. Speaking to baggage services

After returning from Mrs. Wolowitz' funeral, Bernadette and Howard run into trouble at the airport, on THE BIG BANG THEORY, Thursday, Feb. 26 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Pictured left to right: Stephanie Escajeda, Simon Helberg and Melissa Rauch Photo: Monty Brinton/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved
Sharing a moment

9. Sharing a moment

As a joke, Sheldon (Jim Parsons, right) and Penny (Kaley Cuoco-Sweeting, left) try an experiment designed to make participants fall in love, on THE BIG BANG THEORY, Thursday, Feb. 26 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Photo: Monty Brinton/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved