Penny and the Boys

Penny tries to organize a surprise party for Leonard with his friends Sheldon, Howard and Raj.
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Penny and Sheldon Shopping

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 Distracts Leonard

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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The Big Bang Theory Season 1 Episode 16 Quotes

Leonard: How did you know my birthday's Saturday?
Penny: I did your horoscope, remember? I was going to do everybody's until Sheldon went on one of his typical psychotic rants.
Sheldon: For the record, that psychotic rant was a concise summation of the research of Bertram Forer, who, in 1948, proved conclusively through meticulously designed experiments that astrology is nothing but pseudoscientific hokum.
Penny: Blah, blah, a typical Taurus

Penny [on phone]: How about this, you keep him there a little longer, and when you get to the party, I'll point out which of my friends are easy.
Wolowitz: ... Don't toy with me, woman.
Penny: I got a hot former fat girl with no self-esteem, I got a girl who punishes her father by sleeping around, and an alcoholic who's two tequila shots away from letting you wear her like a hat.
Wolowitz: Thy will be done