...I would've become a THEORETICAL physicist.
The Big Bang Theory Season 8, Episode 7
It's very impressive.
For THEORETICAL work.
The Big Bang Theory Season 4, Episode 3
Theoretical physicists do not get canned.
The Big Bang Theory Season 1, Episode 4
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
...to succeed in THEORETICAL physics.
The Big Bang Theory Season 2, Episode 6