The Big Bang Theory, Season 1

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...