
Theoretical physicists do not get canned.
The Big Bang Theory Season 1, Episode 4

She's a neurobiologist, and
I'm a THEORETICAL physicist.
The Big Bang Theory Season 7, Episode 21

I have to tell you that while I do have
a THEORETICAL understanding...
The Big Bang Theory Season 2, Episode 5

...because he said
it was a THEORETICAL nut conflict.
The Big Bang Theory Season 8, Episode 21

...to succeed in THEORETICAL physics.
The Big Bang Theory Season 2, Episode 6