She thought if I failed at THEORETICAL physics
that I should have a trade to fall back on.
The Big Bang Theory Season 2, Episode 10
No, he's a THEORETICAL physicist
at CalTech.
The Big Bang Theory Season 9, Episode 8
So now let's bring out THEORETICAL physicist,
Dr. Sheldon Cooper!
The Big Bang Theory Season 6, Episode 18
You're summa cum laude in THEORETICAL
physics from Stanford University.
The Big Bang Theory Season 6, Episode 3
Now to tell you about
the Theoretical Physics Department...
The Big Bang Theory Season 2, Episode 6