Penny wishes Leonard a happy birthday which she knows is this upcoming Saturday, when she expects him to at least come in for his free piece of birthday cake at the restaurant. She is shocked to learn that Leonard not only does not celebrate his birthday, but that he's never had a birthday party. Regardless of Leonard's wants, Penny decides to throw him a surprise party. Although she gets help from Sheldon, Howard and Raj, the preparation for the party does not go to her plans, including needing to help Sheldon buy a gift, Howard not being able to get Leonard out of the apartment, and Raj not being able to decorate the apartment since Leonard's there. Will Leonard enjoy his first birthday party after all this difficult effort? Written by
Did You Know?
This is the second time that Penny kisses Leonard. She first kissed him after her Halloween party in "The Middle Earth Paradigm". See more
The amount and position of streamers on Raj changes between shots. See more
Look, I am in the "Halo" battle of my life here! There's this kid in Copenhagen; he has no immune system, so all he does is sit in his bubble and play "Halo" 24-7.
Can't you play him some other time?
Not if you believe his doctors.
In the opening scroll of the time line when it gets to 91,000 there is a mistake the dates read 93,000BC 92,000BC 91,0009C 90,000BC for some reason 91,000 is a 9c not a BC. See more
References Léon: The Professional
The Big Bang Theory Theme (Instrumental)
Composed and Performed by Barenaked Ladies See more