
Is it maybe because, like Sheldon's work,
your sex life is also THEORETICAL?
The Big Bang Theory Season 6, Episode 9

What would a THEORETICAL physicist
understand about an experiment anyway?
The Big Bang Theory Season 10, Episode 4

Of course not.
I'm a THEORETICAL physicist.
The Big Bang Theory Season 2, Episode 23

Now to tell you about
the Theoretical Physics Department...
The Big Bang Theory Season 2, Episode 6

Senior THEORETICAL particle physicist
at CaITech, focusing on M Theory.
The Big Bang Theory Season 3, Episode 14