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The Intimacy Acceleration - Season 8, Episode 16
Aired February 26, 2015.
Sheldon and Penny spend the evening performing an experiment to see whether people can fall in love in a few hours. Meanwhile, Leonard, Amy, Raj and Emily visit an "escape room" where they are tormented by a zombie. Meanwhile, Howard and Bernadette encounter trouble as they fly back from Mrs. Wolowitz's funeral.