Now to tell you about
the Theoretical Physics Department...
The Big Bang Theory Season 2, Episode 6
She's a neurobiologist, and
I'm a THEORETICAL physicist.
The Big Bang Theory Season 7, Episode 21
...THEORETICAL physics is... What's the word
I'm looking for? Hmm, cute.
The Big Bang Theory Season 4, Episode 3
Leonard, in the world
of THEORETICAL physics, you never finish.
The Big Bang Theory Season 10, Episode 15
It happens to THEORETICAL
physicists all the time.
The Big Bang Theory Season 5, Episode 17