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Sheldon and Mrs. Hofstadter Sing
Watch The Big Bang Theory Season 2 Episode 15
"The Maternal Capacitance"
Original Air Date:

Leonard's mother, Mrs. Hofstadter (Christine Branksi) comes into town and she ends up being exactly like Sheldon.

Leonard Uses the Board
Watch The Big Bang Theory Season 2 Episode 14
"The Financial Permeability"
Original Air Date:

Sheldon lends Penny some money which makes Leonard go and try and collect some money from her ex-boyfriend Kurt for her.

Sheldon Goes Rock Climbing
Watch The Big Bang Theory Season 2 Episode 13
"The Friendship Algorithm"
Original Air Date:

In order to get time on the super computer at work that he needs for his experiment, Sheldon must befriend Kripke who is in charge of the device.

The Boys and MONTE
Watch The Big Bang Theory Season 2 Episode 12
"The Killer Robot Instability"
Original Air Date:

When Penny's comments about Wolowitz's love life sends him into depression, the boys are about to lose their most important teammate in an upcoming robot fighting competition.

Penny Meets Dave
Watch The Big Bang Theory Season 2 Episode 11
"The Bath Item Gift Hypothesis"
Original Air Date:

It's Christmas time and Sheldon is annoying everyone with his theories on gift giving etiquette. Meanwhile, Leonard gets jealous when Penny stars dating one of his handsome co-workers.

Sheldon and Leonard Discuss the Rules
Watch The Big Bang Theory Season 2 Episode 10
"The Vartabedian Conundrum"
Original Air Date:

When Sheldon and Penny convince Leonard that Stephanie has moved in, Sheldon tries to slow the relationship down.

Sheldon Seeks Penny's Help
Watch The Big Bang Theory Season 2 Episode 9
"The White Asparagus Triangulation"
Original Air Date:

Sheldon tries to secure Leonard's relationship with Stephanie and sets up a scenario where Leonard can prove he's the alpha male.

Leonard and Stephanie
Watch The Big Bang Theory Season 2 Episode 8
"The Lizard-Spock Expansion"
Original Air Date:

Wolowitz thinks he's found his soul mate, Dr. Stephanie Barnett (Sara Rue), until she meets Leonard. Wolowitz lets Stephanie drive the Mars rover, which gets stuck in a ditch.

Howard the Cable Guy
Watch The Big Bang Theory Season 2 Episode 7
"The Panty Piñata Polarization"
Original Air Date:

When Penny's cable goes out, she starts going over the guys' apartment to watch America's Next Top Model. However, after violating some of Sheldon's arbitrary rules, he bands her from coming over.

Sheldon and Romana
Watch The Big Bang Theory Season 2 Episode 6
"The Cooper-Nowitzki Theorem"
Original Air Date:

After an open house night at the University with grad students, an obsessive student Ramona Nowitzki (Riki Lindhome) likes Sheldon and makes her way into becoming his girlfriend / assistant.

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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, there's only one cookie with something in the middle that solves life's problems, and that's an Oreo. Or a Nutter Butter, if you're in a pinch.

Sheldon