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

Bernadette got her DOCTORATE.
The Big Bang Theory Season 10, Episode 11

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

Your DOCTORATE is in neurobiology.
I fail to see the distinction.
The Big Bang Theory Season 4, Episode 24

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