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Leonard and Penny look at Amy as they sit on the couch in the apartment.
'The Hot Tub Contamination' - Season 10, Episode 5
When Sheldon and Amy start bickering over their living situation, Leonard and Penny step in to keep the pair separate and to give them advice on living with a significant other. Meanwhile, after Howard and Bernadette blow off a planned vacation, they observe a pair of unexpected guests in their hot tub.
Air Date: October 17, 2016.