![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
![It happens to theoretical
physicists all the time.
It happens to theoretical
physicists all the time.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
It happens to THEORETICAL
physicists all the time.
The Big Bang Theory Season 5, Episode 17
![...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
![](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
"The physics is THEORETICAL,
but the fun is real."
The Big Bang Theory Season 3, Episode 7
![Maybe we can find
another theoretical physicist to help us.
Maybe we can find
another theoretical physicist to help us.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
Maybe we can find
another THEORETICAL physicist to help us.
The Big Bang Theory Season 10, Episode 15