
...but they made me a junior professor
and are requiring me to teach a CLASS.
The Big Bang Theory Season 8, Episode 2

I also skipped a birthing CLASS
to see Zootopia, so back off.
The Big Bang Theory Season 10, Episode 15

Am I allowed to ask
how the CLASS is going?
The Big Bang Theory Season 6, Episode 6

But this is a graduate-level physics CLASS.
The Big Bang Theory Season 8, Episode 2

And as it was first CLASS, I suspect Ritz.
The Big Bang Theory Season 8, Episode 1