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Penny getting the cold shoulder from Raj's girlfriend Emily was so obvious and the reason why wasn't that obvious but finding out Raj told her about their drunken fumble was amusing, the guy thinking about investing in Stuart comic book store was an interesting idea

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The girls going to Las Vegas for the weekend while the guys had their physicist's retreat was amusing but Penny studying instead was impressive and the Back to the Future analogy was interesting

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Leonard's idea about the joint account was a good one after their previous disagreement but no response to the genius in bed comment was amusing and no response to making out on a pill of money was priceless

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Penny having the Doctor develop a crush on her was understandable especially if she used her looks to promote her products but him falling for anyone who touched him was a little creepy

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Sheldon telling Amy he loves her was a surprise and trust Stuart to bring Jeanie but the fight in the limo was amusing

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Trust Howard to put his foot in his mouth about being married for forty years and Sheldon not being happy about Leonard going into the hospital for an operation was selfish but walking into the door was karma

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Bernadette discovering what her boss really thinks of her I thought was amusing as she looks so sweet and trust Sheldon to open the old bottle of champagne

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It being Penny's idea how the guys get out of their situation was amusing considering they are supposed to be the smart ones and Sheldon being outdone by Amy over Christmas gifts was awesome

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Penny and Amy convincing Leonard and Sheldon into taking them shopping was surprising but Sheldon trying to help them pick something the guys wouldn't like was priceless