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Sheldon Uses Positive Reinforcement
Watch The Big Bang Theory Season 3 Episode 3
"The Gothowitz Deviation"
Original Air Date:

Howard takes Raj with him to the Goth dating scene; Sheldon uses chocolate as part of his behavioral experiment on Penny.

The Boys Search for the Cricket
Watch The Big Bang Theory Season 3 Episode 2
"The Jiminy Conjecture"
Original Air Date:

Leonard and Penny try and make things not awkward after their hookup; Sheldon and Wolowitz bet their best comic books on a bet to determine the species of a cricket

The Boys Come for Sheldon
Watch The Big Bang Theory Season 3 Episode 1
"The Electric Can Opener Fluctuation"
Original Air Date:

Sheldon runs to his mother when he learns the gang messed with her arctice expedition's data; the guys go chasing after him with Leonard sacrificing his chance with Penny.

Leonard in a Snuggie
Watch The Big Bang Theory Season 2 Episode 23
"The Monopolar Expedition"
Original Air Date:

When Sheldon gets news he's going to the North Pole on a NSF expedition, he invites the guys as his group.

Sheldon is Angry at Stuart
Watch The Big Bang Theory Season 2 Episode 22
"The Classified Materials Turbulence"
Original Air Date:

Howard enlists the help of the boys in order to fix his space toilet. Stuart and Penny go on their second date.

Raj and a Prostitute
Watch The Big Bang Theory Season 2 Episode 21
"The Vegas Renormalization"
Original Air Date:

When Wolowitz gets dumped by Leslie, Raj and Leonard take him to Las Vegas to get over his breakup. Meanwhile, Sheldon gets locked out of the apartment and has to crash at Penny's.

Leonard, Penny and Stuart
Watch The Big Bang Theory Season 2 Episode 20
"The Hofstadter Isotope"
Original Air Date:

A friend of the guys who works at the comic book store, Stuart (Kevin Sussman) hits it off with Penny, prompting Leonard and Wolowitz to head out to ladies' night at a local bar.

Raj Talks to Alicia
Watch The Big Bang Theory Season 2 Episode 19
"The Dead Hooker Juxtaposition"
Original Air Date:

Penny gets jealous of the guys' new sexy female neighbor (Valerie Azlynn)

Leonard Plays Laser Obstacle Chess
Watch The Big Bang Theory Season 2 Episode 18
"The Work Song Nanocluster"
Original Air Date:

The boys help Penny with her new business selling Penny Blossoms.

Wolowitz and Summer Glau
Watch The Big Bang Theory Season 2 Episode 17
"The Terminator Decoupling"
Original Air Date:

On a train ride to San Francisco, Leonard, Sheldon, Wolowitz, and Raj discover that Summer Glau is on their train ride.

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TBBT Quotes

I was expecting applause but I suppose stunned silence is equally appropriate.

Sheldon

Sheldon: Nothing more fun than a paradigm shifting evening of science.
Penny: (to Leonard) And you thought it was soaping me up in the shower.