Leonard: My parents focused on celebrating achievements, and my being expelled from a birth canal was not considered one of them.
Penny: That's so silly.
Sheldon: It's actually based on very sound theories; his mother published a paper on it.
Penny: What was it called, I Hate My Son and That's Why He Can't Have Cake?
Sheldon: It was obviously very effective. Leonard grew up to become an experimental physicist. Perhaps if she also denied him Christmas, he'd be a little better at it.
Leonard: Thank you.
Howard: Well, I love birthdays: waking up to mom's special French Toast breakfast, wearing the birthday king crown, playing laser tag with all my friends...
Penny: Yeah! See? That's what kids should have!
Howard: Actually, that was last year...

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