It's a secure lab
in a CLASSIFIED facility,
The Big Bang Theory Season 10, Episode 23
What's CLASSIFIED?
The Big Bang Theory Season 2, Episode 22
Yes, I understand. Classified.
We'll keep it all CLASSIFIED.
The Big Bang Theory Season 2, Episode 22
Oh, the project is CLASSIFIED,
I can't tell you.
The Big Bang Theory Season 10, Episode 19
because it's CLASSIFIED
and top secret.
The Big Bang Theory Season 11, Episode 8