Season 6: Episode 5: The Holographic Excitation

In a Halloween themed episode, Sheldon and Amy disagree over ideas for a couples costume for the party Stuart and Koothrappali are hosting at the comic book store. Wolowitz is back from space and won't stop talking about it, which drives his wife and all of his friends crazy. Meanwhile, Penny goes to visit Leonard at his lab and ultimately gets turned on by watching him work, resulting in them having sex almost every time he starts talking about science around her.

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