The Big Bang Theory

The Intimacy Acceleration

Aired Feb 26, 2015 · 8:00 PM ET · 25 min

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.” And, after returning from Mrs. Wolowitz’ funeral, Bernadette and Howard run into trouble at the airport.