
...I would've become a THEORETICAL physicist.
The Big Bang Theory Season 8, Episode 7

Senior THEORETICAL particle physicist
at CaITech, focusing on M Theory.
The Big Bang Theory Season 3, Episode 14

You're summa cum laude in THEORETICAL
physics from Stanford University.
The Big Bang Theory Season 6, Episode 3

So now let's bring out THEORETICAL physicist,
Dr. Sheldon Cooper!
The Big Bang Theory Season 6, Episode 18

Of course not.
I'm a THEORETICAL physicist.
The Big Bang Theory Season 2, Episode 23