
I have a DOCTORATE in astrophysics
and I'm every bit as awesome
The Big Bang Theory Season 10, Episode 11

You've heard him tease me
about not having a DOCTORATE.
The Big Bang Theory Season 5, Episode 21

SHELDON: Go ahead.
That's the only DOCTORATE you'll ever get.
The Big Bang Theory Season 6, Episode 9

I went to school for half my life.
I have a DOCTORATE.
The Big Bang Theory Season 8, Episode 20

I've been thinking about getting my DOCTORATE,
and he wants to teach. Why not?
The Big Bang Theory Season 8, Episode 2