01:14 — 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 (more…)
01:54 — A mysterious power failure in a major city leads to a nightmarish social breakdown. Everything the people of the city have taken for granted no longer (more…)
An experiment designed to make participants fall in love piques Penny and Leonard's interest, so they decide to put it to the test. Meanwhile, Leonard (more…)
Howard takes Raj along to check out the Goth dating scene. Sheldon uses chocolate as part of a behavior modification experiment on Penny.