Yeah. The DOCTOR didn't want me
to rub my eye during the night.
The Big Bang Theory Season 4, Episode 18
Doctor Fowler and I began an
experiment in living together
The Big Bang Theory Season 10, Episode 7
and you almost
became a DOCTOR?
The Big Bang Theory Season 7, Episode 14
Wow! So that means you're a DOCTOR,
you're a DOCTOR...
The Big Bang Theory Season 4, Episode 24
Because he's a DOCTOR, bitch.
Look it up. It's science.
Breaking Bad Season 5, Episode 9