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

It's very impressive.
For THEORETICAL work.
The Big Bang Theory Season 4, Episode 3

...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

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