The THEORY is that
if you really tax your brain,
The Big Bang Theory Season 10, Episode 22
...the fingerprints of string THEORY
in the aftermath of the big bang.
The Big Bang Theory Season 1, Episode 1
[SINGING]
There was a scientist who had a THEORY
The Big Bang Theory Season 8, Episode 21
Everyone has a different THEORY.
The Big Bang Theory Season 3, Episode 5