
from hearing you obsess about
what to do after string THEORY.
The Big Bang Theory Season 7, Episode 21

...from bosonic string THEORY
to heterotic string THEORY.
The Big Bang Theory Season 1, Episode 15

My THEORY is that his lack of focus
stems from an over-developed sex drive.
The Big Bang Theory Season 2, Episode 15

How dare the university force me
to go back to string THEORY!
The Big Bang Theory Season 7, Episode 24

It's just a THEORY.
It's not even worked out.
The Big Bang Theory Season 10, Episode 23