After some much needed tequila shots after Leonard's mother terrorized them, Penny and Leonard share a drunken kiss!
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Leonard and Penny decide to do some shots of tequila and after licking the salt off Penny's neck, Leonard has to go in for the lime.
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A picture of Sheldon and Leonard's mother (Christine Baranski) looking over some brain scans of Sheldon's. The two of them get along frighteningly well.
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Sheldon may have more neuroses than anyone on the planet, but some how this nerd has no problem doing one of the most awkward things... lending a friend money.
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Leonard uses the board to attempt to find the perfect combination of movie theater and restaurant based on start times and Sheldon's idiotic requirements.
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Sheldon invents his own version of rock-paper-scissors in this episode which includes the addition of a lizard and spock naturally.
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The guys meet Wolowitz's soul mate, Dr. Stephanie Barnett (Sara Rue) in this episode of The Big Bang Theory.
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Leonard goes on a date with Stephanie (Sara Rue), who Wolowitz is convinced is his soul mate.
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Wolowitz dresses up as a cable guy to sneak his way into the America's Next Top Model house. Here two contestants, Analeigh Tipton and Samantha Potter guest star.
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Sheldon meets a graduate student, Ramona Nowitzki (Riki Lindhome) who becomes infatuated with him and soon enters into some form of relationship with him.
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A picture of the whole gang dressed in their clothes from the Renaissance Fair as they get to meet Penny's new date, Eric (Travis Schuldt)
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Leonard and Sheldon return from the Renaissance Fair dressed fully in times. Sheldon is a little disappointed in Leonard for wearing modern underwear.
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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.