It's very impressive.
For THEORETICAL work.
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
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
...I would've become a THEORETICAL physicist.
The Big Bang Theory Season 8, Episode 7
What would a THEORETICAL physicist
understand about an experiment anyway?
The Big Bang Theory Season 10, Episode 4