
Sorry. I didn't get my PhD
in quitting.
The Big Bang Theory Season 11, Episode 15

"Why Sheldon Cooper, PhD...
The Big Bang Theory Season 3, Episode 15

I have a PhD in astrophysics.
The Big Bang Theory Season 10, Episode 18

I have a PhD from Cornell University.
The Big Bang Theory Season 6, Episode 22

I'm getting my PhD.
The Big Bang Theory Season 4, Episode 24