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

Is it any wonder
he doesn't have a DOCTORATE?
The Big Bang Theory Season 4, Episode 18

What's a world-renowned entomologist
with a DOCTORATE...
The Big Bang Theory Season 3, Episode 2

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

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