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

A PowerPoint presentation
by Sheldon Cooper, PhD."
The Big Bang Theory Season 3, Episode 15

and where Leonard got his PhD,
so it may have gone downhill.
The Big Bang Theory Season 10, Episode 24

and where Leonard got his PhD,
so it may have gone downhill.
The Big Bang Theory Season 10, Episode 23

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