Holy kissy face! That's Leonard's mom kissing Sheldon in this stunning photograph.
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Penny comes to Sheldon for help to better understand Leonard's work and here he is training her.
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Bernadette (Melissa Rauch) joins the guys for lunch at work as she begins to bond with Leonard over his work.
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Wolowitz confronts Leonard when he gets jealous over his friend bonding with his girlfriend, Bernadette.
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Raj and Sheldon race... with a little Mario Kart on the Wii.
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Wolowitz gets jealous when Leonard and his girlfriend Bernadette (Melissa Rauch) get friendly.
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Who knew Wolowitz could sing and play the keyboard? Well soon Bernadette will know.
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Howard Wolowitz comes to visit his new girlfriend, Bernadette (Melissa Rauch) at the Cheesecake Factory. He's desperate to keep her.
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Kripke holds up a radio as he taunts Sheldon for being embarassed on NPR.
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Wolowitz is desperate to try and keep his new girlfriend, Bernadette (Melissa Rauch) that Penny introduced him to.
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When Sheldon is embarrassed by Kripke on National Public Radio, Sheldon comes to comfort his friend.
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Raj attempts to scare the guys with a ghost story but they look a little more bored than scared.
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TBBT Quotes

Penny: What actor holds the record for being named People magazine's Sexiest Man Alive?
Sheldon: William Shatner!
Leonard: I don't think it's Shatner.
Sheldon: Then it's got to be Patrick Stewart

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.