![Leonard, in the world
of theoretical physics, you never finish.
Leonard, in the world
of theoretical physics, you never finish.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
Leonard, in the world
of THEORETICAL physics, you never finish.
The Big Bang Theory Season 10, Episode 15
![...because he said
it was a theoretical nut conflict.
...because he said
it was a theoretical nut conflict.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
...because he said
it was a THEORETICAL nut conflict.
The Big Bang Theory Season 8, Episode 21
![So now let's bring out theoretical physicist,
Dr. Sheldon Cooper!
So now let's bring out theoretical physicist,
Dr. Sheldon Cooper!](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
So now let's bring out THEORETICAL physicist,
Dr. Sheldon Cooper!
The Big Bang Theory Season 6, Episode 18
![Is it maybe because, like Sheldon's work,
your sex life is also theoretical?
Is it maybe because, like Sheldon's work,
your sex life is also theoretical?](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
Is it maybe because, like Sheldon's work,
your sex life is also THEORETICAL?
The Big Bang Theory Season 6, Episode 9
![It's very impressive.
For theoretical work.
It's very impressive.
For theoretical work.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
It's very impressive.
For THEORETICAL work.
The Big Bang Theory Season 4, Episode 3