Season 4, Episode 4 - The Hot Troll Deviation
Aired October 14, 2010
Howard is embarrassed when the creepy reason behind his break-up with Bernadette is revealed. Meanwhile, a spat between Sheldon and Raj gets ugly as they engage in office warfare.
Season 10, Episode 5 - The Hot Tub Contamination
Aired October 17, 2016
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. Sheldon threatens to see other women if Amy won't fall in line with his demands, including for her to follow a bathroom schedule.
Meanwhile, after Howard and Bernadette blow off a planned vacation, they observe a pair of unexpected guests in their hot tub.