Leonard finally gets the apartment to himself for a date with Leslie Winkle. How will it go?
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Penny and Sheldon sit outside the apartment and talk while Leonard takes over the apartment for his date with Leslie.
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Leonard comes home to find out the guys spied on how his date with Penny went via a webcam they put in the hallway.
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Penny tells poor Sheldon a secret whether he wants to hear it or not. Unfortunately that secret involves Leonard and puts him in a difficult situation.
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Penny and Leonard return from their first date and Penny tells Leonard she wants to take it slow. Poor guy.
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Sheldon attempts to befriend Kripke in order to use his super computer at work. As a result, Sheldon is forced to go rock climbing and isn't too happy with the height.
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Penny hugs Leonard after he does his best to comfort her after he ex reveals intimate details about her on his blog.
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Wolowitz teaches Sheldon Mandarin so he can correctly order his Chinese food to make sure he gets tangerine instead of orange chicken. Makes sense to us.
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Leonard and Penny are about to kiss in this still. Leonard finally asked out Penny on a real date after she was hurt by her ex.
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Penny tries to organize a surprise party for Leonard with his friends Sheldon, Howard and Raj.
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Penny makes Sheldon go to a computer store to pick out a gift for Leonard for his birthday but he ends up very distracted.
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Wolowitz uses his peanut allergy to try and distract Leonard long enough for Penny and the gang to set up her surprise party.
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TBBT Quotes

Penny: Here's a question-- as an alien pretending to be human, are you planning to engage in any post-prom mating rituals with Amy?
Sheldon: There are post-prom mating rituals?
Penny: Not always. Unless your date drives a van with an air mattress, then always.
Sheldon: Well, if it's part of the prom experience, then I'm open to it.
Penny: You're kidding.
Sheldon: I may be an alien, but I have urges.If Amy wants to copulate by firing her eggs into space, well, then, I will happily catch them with the reproductive sac on my upper flermin. I'm not the best at reading facial cues, but I can see that you're a little turned on.

Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.