The Plimpton Stimulation Season 3, Episode 21 - Aired May 10, 2010
The gang is surprised to hear Sheldon is having a female guest stay over. Although Sheldon's interest in his guest is purely academic, Dr. Elizabeth Plimpton invites a different kind of attention when she meets Leonard, Howard and Raj.
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Guest Stars: Judy Greer as Dr. Elizabeth Plimpton
Director: Mark Cendrowski
Viewers: 13.73 million Households Rating: 8.2/13 Adults 18-49 Rating: 5.3/13
- The title refers to Sheldon's guest, Dr. Elizabeth Plimpton, and the stimulating effect she has on the guys.
When the guys are surprised to hear Sheldon will be having a female companion stay in his bedroom, they wonder whether he's kiding them. Sheldon tells Howard "A, I rarely kid. And B, when I do kid, you will know it by my use of the word Bazinga". When Howard asks if the two of them will be sleeping in the same bed, Sheldon tells him "Yes. Bazinga."
When Leonard wonders whether Sheldon's female guest is human, Sheldon reminds him that pets are banned under the roommate agreement, with the exception of service animals and, one day, cybernetically-enhanced helper monkeys.
Howard: Are you planning on kidnapping a woman?
Howard: Yes, but mixed with genuine concern.
Howard: I have a two-part question.
Sheldon: Go ahead.
Howard: A: Are you kidding? And B: Seriously, are you freaking kidding me?
Sheldon: A: I rarely kid, and B: when I do kid, you will know it by my use of the word "Bazinga".
Howard: So you're saying the two of you are going to be sleeping in the same bed?
Sheldon: Yes. Bazinga.
Sheldon: Pee for Houston, pee for Austin.
Pee for the state my heart got lost in.
And shake twice for Texas.
Sheldon: Good night. And if there's an apocalypse, good luck.
Raj: I don't wanna sit by myself.
Sheldon: That's what Typhoid Mary said and clearly, her friends buckled.
The guys are stunned when Sheldon informs them he will be having a female guest, Dr. Elizabeth Plimpton - a noted physicist, stay over. Sheldon quizzes Penny about the "female hygiene product" he bought for his guest, while Penny is just as puzzled as the guys at Sheldon having a female visitor.
As Sheldon welcomes Dr. Plimpton to the apartment, a nervous Leonard fears he made a fool of himself. After Sheldon shows Dr. Plimpton to her room and explains the apartment's emergency procedure, she goes to Leonard's room and starts flirting with him. The next morning, Sheldon wakes up to find a smiling Leonard and Elizabeth. When Penny comes over for a ride to work, she is introduced to Elizabeth and immediately picks up on what happened over night. Sheldon is shocked to hear that Leonard betrayed him.
At the cafeteria, Leonard is dropping hints about his enjoyable night, but the guys are not picking up his subtle clues. When Sheldon arrives with Dr. Plimpton, she immediately starts flirting with Raj. That night, Howard turns up at Raj's apartment for Halo night, but Raj tries to brush him off. When Howard finds Dr. Plimpton there, she invites him in for a "role-playing game". When Leonard arrives, she invites him in too. The guys consider the rare opportunity they've been presented with, but ultimately decide they don't want to see each other naked. Raj tricks Howard and Leonard into leaving the apartment, then continues his night with Elizabeth.
Later, Leonard tries to explain his amorous encounter to Penny, but she tells him he doesn't owe her an explanation. When Leonard persists in explaining it to Penny, his reasoning for his sexual encounter is "She let me.".