
What a lousy way to spend a BIRTHDAY.
Well, it's all over now.
The Big Bang Theory Season 1, Episode 16

Happy BIRTHDAY, young man.
The Big Bang Theory Season 9, Episode 17

Leonard, pick me up comics
for my nephew's BIRTHDAY?
The Big Bang Theory Season 2, Episode 20

Maybe later I'll get to see you
in your BIRTHDAY suit.
The Big Bang Theory Season 9, Episode 17

I'll be celebrating
Amy's BIRTHDAY with her,
The Big Bang Theory Season 9, Episode 11